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CTEK MULTI US 4.3 Universal 12-Volt Battery Charger with Pulse Maintenance and Small Battery Mode

Item # CTEK56864

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ctek power inc battery chargers reconditions 8-step charger multi us 4.3 universal 12-volt with pulse maintenance and small mode
ctek power inc battery chargers charges and maintains charge reconditions
ctek power inc battery chargers charges and maintains charge reconditions
ctek power inc battery chargers charges and maintains charge reconditions ctek56864
ctek power inc battery chargers charger reconditions multi us 4.3 universal 12-volt with pulse maintenance and small mode
ctek power inc battery chargers charger 8-step

In Use/Installed

2014 polaris ranger crew 570 battery chargers ctek power inc charger reconditions multi us 4.3 universal 12-volt with pulse maintenance and small mode
2014 polaris ranger crew 570 battery chargers ctek power inc charger reconditions ctek56864
2014 polaris ranger crew 570 battery chargers ctek power inc charges and maintains charge reconditions ctek56864
2014 polaris ranger crew 570 battery chargers ctek power inc charges and maintains charge reconditions in use


  • Battery Charger
  • Charges and Maintains Charge
  • 12 Volts
  • CTEK Power Inc
  • 8-Step Charger
  • Reconditions Battery
This powerful, all-weather, 8-step charger uses a patented pulse-maintenance system to charge, maintain and help recondition 12V batteries. Includes a mode for small batteries. Sophisticated automatic charge cycle achieves the perfect charge. Call 800-298-8924 to order CTEK Power Inc battery chargers part number CTEK56864 or order online at Free expert support on all CTEK Power Inc products. Guaranteed Lowest Price and Fastest Shipping for CTEK MULTI US 4.3 Universal 12-Volt Battery Charger with Pulse Maintenance and Small Battery Mode. Battery Chargers reviews from real customers.

CTEK Power Inc Battery Chargers - CTEK56864

This powerful, all-weather, 8-step charger uses a patented pulse-maintenance system to charge, maintain and help recondition 12V batteries. Includes a mode for small batteries. Sophisticated automatic charge cycle achieves the perfect charge.


  • 8-Step system constantly monitors and maintains 12V battery charge
    • Performs reliably and is virtually maintenance free
    • Won't overcharge or undercharge like typical trickle chargers
    • Switches automatically to pulse-maintenance phase when full charge has been reached
    • Reduces risk of overheating, sulfation and premature battery failure
    • Includes option to recondition stratified or highly discharged batteries
  • Highly versatile - offers (4) 12V current modes
    • Motorcycle icon: lower current for smaller 12V batteries
    • Car icon: higher current for larger 12V automobile and marine batteries
    • Snowflake/AGM icon: special winter mode charges and maintains batteries in cold weather
      • Recommended by many AGM battery manufacturers like Optima, Maxima and Odyssey
    • Recond (recondition) icon: higher current for reconditioning batteries that have been deeply discharged
  • Easy-to-use, quick-disconnect system features Comfort Connect end plugs - charger plugs right in
    • Eyelet-terminal cable permanently attaches to battery terminals
    • Clamp-terminal cable temporarily clamps to battery terminals
  • Safe design
    • Approved for indoor and outdoor use
    • Prevents reverse-polarity mistakes
  • Convenient accessories (sold separately) provide additional security and convenience
    • LED indicator battery cable lets you monitor your battery's charge at a glance
    • Additional battery-hookup cables simplify charging multiple vehicles
  • Includes charger, cables with battery-terminal clips, cables with M6 (6.4-mm) eyelet terminals, owner's manual and protective case


  • Application: most starter and deep-cycle, 12V, lead-acid batteries
    • Includes wet, MF, AGM and most gel batteries
    • Charges batteries with capacities from 1.2 Ah to 110 Ah
    • Maintains batteries with capacities up to 160 Ah
  • Charge cycle: 8-step, fully automatic charger with pulse maintenance and Reconditioning Mode
  • Input voltage: 110V AC - 120V AC
  • Charging voltage:
    • Normal charge: 14.4V
    • Recondition mode: 15.8V
  • Charging current: 0.8A or 4.3A max
  • Dimensions: 6-1/2" long x 2-1/2" wide x 1-1/2" tall
  • 5-Year warranty

CTEK MULTI US 4.3 bulk charging time chart

This CTEK charger comes with two battery cables: one with clamp terminals and one with eyelet terminals. The 16" long eyelet-terminal cable can be left attached to the battery, and the clamp-terminal cable is great for temporary connections.

CTEK MULTI US 4.3 Charger with both clamp and eyelet cables

Whenever you want to charge the battery, just plug CTEK's patented Comfort Connect attachment terminal into the receiving end on either of the provided battery cables.

Close-up of CTEK's Comfort Connect plugs

CTEK MULTI US 4.3 Charging Process

A goof-proof design distinguishes CTEK's new-generation chargers from the competition - you don't have to be a mechanical guru to keep your battery working at top efficiency. CTEK's patented charging system monitors your battery, providing exactly the charge it needs during each unique charging stage. Safe, eight-step process uses switch-mode, pulse-maintenance technology.

CTEK MULTI US 4.3 charging process chart

  1. Desulfation stage is the initial charging phase. This stage uses electronic pulses to desulfate batteries by converting lead sulfate crystals back to usable sulfuric acid.
  2. Soft-start stage tests the battery to see whether it can be charged. If the battery is unable to hold the initial charge, the unit goes into Error Mode, alerting you that your battery must be replaced.
  3. Bulk stage is the main charging phase. This stage accounts for 80 percent of the charging process and uses a constant charge level.
  4. Absorption stage completes the charge (to virtually 100 percent) using diminishing current to prevent battery damage.
  5. Analysis stage kicks in if the pre-set maximum time needed for absorption is exceeded. The unit measures the battery voltage and stops the charging process, automatically triggering an error indicator if the battery is faulty.
  6. Recond mode is used to recondition a battery that has been severely discharged. After the battery has been charged in Normal Mode and analysis has been completed, the charger reconditions the battery with a constant current of 1.5A and maximum voltage of 15.7V for up to 4 hours.
  7. Float-maintenance stage maintains a constant voltage of 13.6V during the first 10 days.
  8. Pulse-maintenance stage begins after the 10 days of float maintenance. During this stage, the charger maintains the battery at the optimum charge level of 95 percent to 100 percent. It recognizes any drop in voltage and sends a corresponding pulse of current to keep the battery properly charged. Pulse maintenance can be continued for months at a time.

Protects the User

Your personal safety is paramount, and CTEK's spark-free, short-circuit-proof design incorporates a feature that prevents reverse polarity, keeping you safe. You simply cannot make a polarity mistake: The charger will not operate if it is attached incorrectly. In addition, the red alarm light on the charger alerts you if there is a reverse-polarity problem.

Protects the Battery

CTEK's patented switch-mode, pulse-maintenance charging system is designed with the most up-to-date technology to safely charge your battery. Using carefully monitored, low-grid voltage, CTEK's patented process differs from competitors' chargers by providing the precise final voltage that your battery needs to maintain the optimum charge level. This sophisticated, interactive device will never overcharge or undercharge your battery. You can leave it attached to the battery for months, making it perfect for seasonal vehicle storage.

Won't Cause Overcharging or Overheating

Overcharging can cause gassing, which can lead to acid concentration and corrosion of the battery's lead plates. It can also cause the battery cells to dry out ("boil dry"), which can allow the battery to overheat and cause a fire.

Won't Cause Undercharging or Sulfation

Undercharging can be just as damaging to your battery as overcharging because chronic undercharging leads to sulfation. Sulfation occurs when the lead and lead dioxide of the battery's plates react with sulfuric battery acid to produce lead sulfate. This in turn is converted back to lead, lead oxide and sulfuric acid. A small, unavoidable amount of sulfation and gassing naturally takes place as a result of the chemical processes occurring in lead-acid batteries. However, extensive undercharging causes extra lead sulfate to accumulate on the lead plates of the battery. Because the crystalline form of the sulfate cannot hold an electrical charge, excessive sulfation greatly diminishes the charging ability of the battery, eventually rendering it unusable.

Provides Desulfation Using a Patented Process

Desulfation is the reversal of sulfation damage. The CTEK charger's unique process not only prevents the undercharging that produces excess sulfation, but it also includes a desulfating step that can often "revive" a lightly sulfated battery. It accomplishes this with carefully monitored electronic pulses of energy that help to break down the lead sulfate crystals, allowing the battery to accept a charge once again.

Ensures Consistent Charging with Low Ripple-Wave Percentage

Ripple-wave percentage is the quantity of disturbances exhibited in current and voltage. CTEK's low-ripple design regulates the incoming current before passing it on to your battery, ensuring a consistent charge. Unlike an old-style charger, this CTEK charger maintains precise control over the output current, keeping a battery healthier, more productive and longer lasting.

Protects the Vehicle and Its Electronics

The charger is also safe for your vehicle. Its sophisticated circuitry is designed to be compatible with today's sensitive electronics and audio equipment. You can confidently charge your battery while it is still in the vehicle: no more hefting heavy batteries or dealing with tiresome system resetting! CTEK's low ripple rate eliminates the danger of damaging electronic devices connected to the battery, and it prolongs the battery's service life. Because the Recond (reconditioning) mode uses a higher voltage than other charging modes, using it may cause water loss in batteries and possibly shorten the life of your electronics. Check with vehicle manufacturer and battery supplier for information.

Keeps You Informed

Indicators on the face of the charger light up to show the charging stage.

CTEK MULTI US 4.3 indicator diagram
CTEK MULTI US 4.3 function chart

Additional Specs

  • Current: 1.1A rms (at full charging current)
  • Back current drain: less than 1Ah per month
  • Ripple wave: less than 4 percent of rated current
  • Ambient temperature: -4 F to 122 F
    • Automatic reduction of power at increased ambient temperature

56-864 CTEK MUS 4.3 12-V 8-Step Universal, Pulse-Maintenance, Lead-Acid Battery Charger

CTEK56864 Installation InstructionsInstallation Details CTEK56864 Installation instructions

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Video of CTEK MULTI US 4.3 Universal 12-Volt Battery Charger with Pulse Maintenance and Small Battery Mode

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for CTEK Universal 12-Volt Battery Charger Review

All right. Today we're going to review part number CTEK56864 from CTEK. This is a CTEK multi US 4.3 universal 12-volt battery charger with pulse maintenance and small-battery mode. A few things to know about this charger is that it comes with a variety of accessories. First off it comes with the familiar pair of clamps that go to the top of the battery to charge the battery. It also has a permanent install port that you can install to your battery.

That simply just bolts on to your existing battery post, and you get an easy plug-in whenever you need it. The charger itself has an easy-to-use connection point that will plug into whichever way you attach to your battery. When you're not using it it also comes with it's own storage bag. First we'll go ahead and show you how the charger will be used in a conventional way. First off we'll go ahead and take our clamps and attach it to our car battery. Then we'll take the battery charger and plug it into the port.

Lastly we go ahead and plug the charger into the wall. Then we need to select a mode, whether it's for a motorcycle, a car, a deep-cycle battery, or a reconditioning. Once we have the proper mode selected, then there's an indicator bar on top that shows you the progress of the battery charger. When the series of LEDs is all lit, the battery charger and maintenance is complete. Now for a car that gets stored for a long time and you want a permanent connection to the battery for the charger, you can use the CTEK comfort connect eyelet. These eyelets will connect directly to the battery. We'll go ahead and install it to this battery to give you and idea of how it looks and how it works.

In this case we're just going to use a couple extra nuts to go to the post on our battery. Now each battery's going to be different. There may be a need for extra accessories to connect to your battery. Once we get this permanently installed we can go ahead and use the charger to maintain the battery over long periods of time. Also when we need to use the vehicle, we'll take the port for a charger, put the cap back on, and then just tuck it out of the way, and we're ready to go.

Also for short periods of time you could use the CTEK comfort connect clamp to maintain the battery. Clamps just basically clamp on to your battery terminals. You can maintain your battery that way. Now this charger is designed not only for cars, but other vehicles as well, such as ATVs, UTVs, anthign that has a battery that gets stored for a long period of time can benefit from the use of the CTEK battery charger. For an example, we'll go ahead and use it on a UTV. Our UTV has already been equipped with a CTEK battery health indicator with panel box. This has part number CTEK56380. All we need to do is go ahead and take our CTEK charger and plug into the side. This UTV can sit for as long as it's needed, and the battery will be protected and charged. We're now finished for the review of the CTEK multi US 4.3 Universal 12-volt battery charger. .

Customer Reviews

CTEK MULTI US 4.3 Universal 12-Volt Battery Charger with Pulse Maintenance and Small Battery Mode - CTEK56864

Average Customer Rating:  5.0 out of 5 stars   (40 Customer Reviews)

This powerful, all-weather, 8-step charger uses a patented pulse-maintenance system to charge, maintain and help recondition 12V batteries. Includes a mode for small batteries. Sophisticated automatic charge cycle achieves the perfect charge.

- CTEK56864

by: Bill Y.09/28/2015

I really like the recondition feature on this charger. It reconditioned and charged my aging battery very promptly. I also like the compact size of the unit. Great product. 228077


My 4 year old truck battery started losing charge after sitting a few days. I removed it, checked the water which was a bit low, put it on recondition mod and recharged. It has been working like a new one for the past two months.

Bill Y - 09/27/2016


- CTEK56864

by: Barney B05/24/2014

Very high quality, compact, easy to use charger with many features. It is perfect for maintaining a charge on batteries that only get utilized periodically but can be used to charge as well. Would definitely recommend both the charger and 132255


Still very pleased. Works great!!

Barney B - 05/26/2015


- CTEK56864

by: Tom07/21/2016

I bought two of these based on the recommendations of people on the Jet-Ski forum I'm on. I also found out that Porsche recommends this brand for their vehicles. I use them to maintain the charge in my intermittently used car and Jet-Ski so the chargers are used a lot. In one year of use I haven't had any battery or charger problems. The unit is capable of maintaining a charge and restoring a charge to a flat battery. It is hard to measure the performance of a charger but compared to previous chargers I have used I think it does a great job of keeping the battery functional. 274426

- CTEK56864

by: Adam R. - Employee01/20/2014

I have another trickle charger that I've used for years on my older Harley, but it is a single-mode charger. I decided to get a second one so I do not have to constantly move the one from the bike to the lawn mower to the car, etc and chose this one based on excellent reports from my co-workers who also use this C-TEK unit. Having had this in use for about 3 weeks now I can report that it works well, offers several modes, including the winter storage mode I am using now, and came with very detailed instructions and plenty of adapters for various applications. I'd buy this again. 114205

- CTEK56864

by: David04/08/2013

The reconditioning mode on the 4.3 did in fact recondition my car battery when simply charging it with a CTEK 3.3 didn't. I conclude this based on the better retention of charge after the 4.3 than after the 3.3. As always, etrailer's service was prompt and courteous when I ordered a second 4.3 DS 74922

- CTEK56864

by: A.J.09/18/2014

After a recommendation from our mechanic, we purchased two CTEK trickle chargers and are extremely excited about how they will benefit the battery life of these cars over the next several years. All we can say now is, so good. 151954

- CTEK56864

by: Gary11/09/2016

Great performance in a light weight small package. Very sophisticated charging options to charge a wide variety of batteries in various temperature conditions. I trust this charger for my best quality batteries. 315287

- CTEK56864

by: Dan S.12/20/2013

This CTEK charger got my large automotive battery up to full capacity in no time, and is maintaining it perfect through cold winter storage. As usual, prompt & well packaged delivery from etrailer! 110746

- CTEK56864

by: Thomas05/28/2016

Powerful compact unit. Boat battery after winter storage charged right up. Even used the charger for smaller rechargeable batteries used in wireless speakers. Stores away very neatly in tool box 252754

- CTEK56864

by: Michael G10/29/2014

Purchase battery charger to charge batteries in my new trailer. Charged batteries to full capacity and went into float mode. Very satisfied with product and would highly recommend it to others. 158388

- CTEK56864

by: Blake A08/26/2017

The complete charger is for a Mercedes Sprinter Motor Home, Pleasure Way. It works flawlessly in keeping the house battery charged and topped our as needed. Best charger I have found. 425540

- CTEK56864

by: AD03/25/2013

I have ordered products from etrailer for years and have never been disappointed in the products , price or promptness of delivery. 72365

- CTEK56864

by: Ted C.11/28/2012

Have ordered from etrailer in the past, fast shipping and battery charger seems to operate fine! 60127

- CTEK56864

by: R Hochnadel02/20/2014

Exactly what I needed to maintain several different size batteries at the same time. 117061

- CTEK56864

by: Emma E11/05/2016

Easy to use, kept my battery up all winter without any problems. Would recommend. 313983

- CTEK56864

by: Michael03/12/2017

With this items I am fully satisfied - thanks for follow up - any time again 351641

- CTEK56864

by: L. Ott02/26/2015

Arrived quickly and Works like a charm on my deep cycle, trailer battery. 176255

- CTEK56158

by: Bob B. - Employee11/14/2013

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Got a booming radio that tends to kill the battery after a day of hanging out at the gravel bar. This charger I installed under the hood and ran the plug to the front bumper. So I have 2 options. 1. If there is power nearby just plug it in and no worries. 2. At the end of the day when back at the house just plug in overnight so battery is fully charged the next day without needing to leave the truck running to charge back up. 107360

- CTEK56353

by: Mike N.04/04/2015

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Excellent product, keeps my deep cycle battery up to charge. 183123


Still works great, no issues.

Mike N - 04/03/2016


- CTEK56158

by: Richard F.07/06/2015

Review from a similar CTEK Power Inc MULTI in Battery Chargers

The charger works great in the charge mode. An Optima battery took an overnight charge. And the weekend car also charged overnight. It is now on the maintenance mode. The two types of connections are very helpful. 209671


The charger works great. And it is easy to use.

Richard F - 07/27/2016


- CTEK56158

by: Kevin12/26/2012

Review from a similar CTEK Power Inc MULTI in Battery Chargers

The CTEK 3300 is being used to keep my hot rod battery charged because it's not a daily driver. It took about one day and then the amber light turned green and has stayed that way for a month now. All I do is unplug the unit from the car and it starts right up. It sure is nice to be able to leave this one hooked up to the car in place of my older one that I would only use for a few hours at a time. So far I'm very happy with it and I would buy another one if I had two batteries to keep charged. 61891

- CTEK56158

by: Tom T.12/22/2016

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Good price, fast and friendly service. Items arrived on time and well packaged. I'm impressed that etrailer even sent a follow-up email to confirm my satisfaction. I have used the CTEK 3300 charger for over 5 years and it is outstanding. It has done a perfect job of charging/maintaining gel batteries on 3 vehicles and two tractors. Purchased two more to give family members as gifts. Thanks etrailer! 327189

- CTEK56158

by: Bruce K.12/18/2016

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Ordered this item to go with the CTEK battery charger I also ordered. Now I don't have to pop open the hood to connect the CTEK charger to the battery. The items were shipped quickly even with the poor weather conditions we were enduring. I've always liked their price and assistance available for merchandise purchased thru etrailer. Kudos for the staff at 326852

- CTEK56353

by: Todd06/07/2011

Review from a similar CTEK Power Inc MULTI in Battery Chargers

This is my second purchase for etrailer. The service has been excellent each time, and the quality of the products is also excellent. The CTEK battery charger is easy to use. I have used it on Optima batteries, which don't charge as well on conventional chargers. It works great. Just hook it up, and it stops when it is finished. 16321

- CTEK56158

by: Ken Young12/21/2016

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Just received this product today. I installed it in my Fiat 124 Spyder and it is charging now. Seems to be working OK and correctly 327115

- CTEK56353

by: BP Travel04/07/2015

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Excellent product does as advertised. I read a comment from one of the eTrailer experts that this battery charger can provide 12VDC as a power supply. Hooked it up and it does exactly what I need - providing shore power a few lights and fans in my cargo (motorcycle) trailer. 183861

- CTEK56158

by: Calvin M.01/24/2015

Review from a similar CTEK Power Inc MULTI in Battery Chargers

The Ctek charger is small, but very effective. I have a vehicle that I only drive once or twice a month. Now I don't have to worry about the battery being dead and having to have the computer reprogram after jumping it off. Works great. Thanks Etrailer!! 171103

- CTEK56158

by: Martin M.09/29/2014

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Needed a way to keep my Scag's battery topped off in between mowings. Love the ability to hardwire an adapter to the battery that I can quickly connect or disconnect from charger. Works great and quick shipping too. Thanks etrailer! 153569

- CTEK56158

by: Pete V10/01/2016

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Exactly what I needed etrailer had. Fast delivery everything I ordered was in great condition. Great service. Have ordered from etrailer several times, always on time and is exactly what was ordered. 302707

- CTEK56158

by: Steve R07/13/2016

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Product arrived a day early, I immediately put it to use on a weak battery. Easy to assemble and use. Service and follow up by etrailer has been excellent. 271294


Its been a year, this charger gets infrequent use however, when I need it it works simply and effectively. Very satisfied.

Steve R - 07/14/2017


- CTEK56158

by: Matt07/06/2015

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Using this on battery back sump pump system. Customer service was very helpful when I had questions on which model to order for the application. Thank you. 209839

- CTEK56158

by: Isaac D.12/23/2014

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Easy to follow directions, battery is charging at this present moment. Lightweight small and convenient. I have no doubt that it will satisfy my needs. 166722

- CTEK56158

by: Chet M.12/29/2016

Review from a similar CTEK Power Inc MULTI in Battery Chargers

So far it looks great. Easy to set up and use. I'm using it to charge two 6 volt batteries hooked up in series. 328741

- CTEK56158

by: Joel B.06/30/2011

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Great charger's that are made by CTEK E-Trailer's service is great and fast. 18284

- CTEK56158

by: Robert LaBonte10/08/2013

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Very well made. Seems to have every needed option. 103020

- CTEK56353

by: Tom12/26/2014

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Excellent product but Made In China. 167002

- CTEK56158

by: J04/13/2016

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Great design / features, easy to use. 244072

- CTEK56158

by: Andy09/23/2016

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Works as advertised, no issues 297993

- CTEK56674

by: George J05/14/2017

Review from a similar CTEK Power Inc MULTI in Battery Chargers

Thank you works GREAT 380259

- CTEK56158

by: Triple D Ranch07/22/2013

Review from a similar CTEK Power Inc MULTI in Battery Chargers

thank's work's good 90944


Ask the Experts about this CTEK Power Inc Battery Chargers
Do you have a question about this Battery Charger?

  • Charging Capacity of 12-Volt Circuit on Vehicle 7-Way Socket
  • The power delivered on the 12V circuit of a 7-way trailer connector is enough to maintain a battery while you travel down the road, but this circuit does not have enough juice to re-charge a battery that has been depleted from use. Depleted batteries need a shore-powered charger like one of the CTEK units, such as # CTEK56864. Solar battery chargers like Performance Tool # PTW2997 can be used to provide a trickle charge to a battery mounted on a trailer but I do not recommend it for...
    view full answer...

  • Will The CTEK MUS 4.3 Battery Charger Charge a Deep Cycle Battery
  • Yes, the CTEK MUS 4.3 12-Volt Battery Charger, # CTEK56864, will charge deep cycle batteries. You may also be interested in the CTEK MULTI US 3300 Battery Charger, # CTEK56158. This charger will also charge deep cycle batteries, but does not come with the switch for small or larger batteries. I have attached a video of this charger for you to check out.
    view full answer...

  • Choosing Between CTEK 3300 and 4.3 Battery Chargers for Use on 2012 BMW X3 SUV
  • A maintenance charger is a great way to help maintain a healthy 12V battery when stored for long periods, especially in cold weather. I have used a CTEK charger on my motorcycle battery (year-round, any time it is in the garage) for over a year and it has proven to be reliable and effective at keeping that battery charged and ready to go. The main differences between the two CTEK units you referenced, their MULTI US 3300 # CTEK56158 and their MULTI US 4.3 # CTEK56864, are the maintenance...
    view full answer...

  • Recommended DC Battery Charger for Trailer Battery
  • For a battery charger that can handle the DC input from multiple sources to automatically charge and maintain your trailer battery I suggest the CTEK D250S DUAL Universal 12-Volt Battery Charger # CTEKD250S. This unit switches automatically to pulse-maintenance phase after batteries are fully charged. This charger works with wet, MF, AGM and most gel batteries with an amp-hour rating from 40 Ah to 300 Ah. For an additional input power source you might consider a solar charger panel like...
    view full answer...

  • Can the Recondition Mode of a CTEK Battery Charger Used Indefinitely
  • The # CTEK56158 that you referenced does not have a recondition mode. But when you select the recondition setting for the CTEK MULTI US 3300 12-Volt Universal Battery Charger # CTEK56864 it will stay in that setting for as long as needed and then it will move onto the regular charging phases of the charger. It sounds like your battery is still in pretty good shape so it wouldn't stay in the recondition setting very long. You cannot manually keep this charger in recondition mode.
    view full answer...

  • Does CTEK Multi Charger part # CTEK56864 Work Well for Vehicle and Motorcycle Batteries
  • The CTEK Multi Charger part # CTEK56864 that you referenced will work well on both a motorcycle battery and a vehicle battery. It has a setting for either battery so it will function perfectly for either application. I have this exact charger and use it on both a motorcycle and a vehicle and have found that it does a great job for both. If you left either of vehicle in storage with this charger on the battery you'd be totally fine.
    view full answer...

  • Can Breakaway Kit Battery Be Charged from Main Trailer Battery Without Depleting It
  • It is permissible to have your trailer breakaway and water pump wired in the way you describe - under certain circumstances. As long as your water pump battery is substantially larger in current capacity than the breakaway battery, and as long as BOTH batteries are in good condition and fully charged before you head out, then the 12V maintenance charge from your vehicle 7-way wiring harness should be able to maintain both batteries without either becoming depleted. I suggest you apply...
    view full answer...

  • Trailer Side Wire Functions for 6- and 7-Way Connectors for a Dump Trailer
  • It sounds like you have either a 6-Way or 7-Way connector. I have included a couple of pictures that show the functions of 6- and 7-Way connectors for you. Basically, the 12 volt circuit from the vehicle connector will pass through to the trailer side connector and you can attach the wire associated with that circuit directly to the positive terminal of the first battery. Keep in mind that when 2 batteries are hooked together like you have it takes longer for the second battery to get...
    view full answer...

  • Differences Between CTEK Battery Chargers # CTEK56864 and # CTEK56158
  • Both products are smart chargers, meaning that they adjust their charging current and voltage continuously depending on the condition of the battery being charged, rather than pump the same current continuously. Both automatically switch to pulse maintenance mode once a full charge is reached. I have included a manufacturer video that might be of interest and also one demonstrating one type of installation in a vehicle of part # CTEK56158. The CTEK Multi Universal Charger, part #...
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  • Parts Needed to Have 12V Trailer Battery Charging Circuit on 7-Way Connector
  • The charging circuit on a vehicle 7-way style connector, the one that would deliver a maintenance charge to the trailer battery while you tow, is completely separate from the 4-wire brake controller wiring. This trailer charging circuit is usually carried on the contact at the 1-o-clock position as you look at your van's 7-way socket (please see photo). Note this circuit deliver a maintenance-level charge to keep a charged battery topped off, but it does NOT deliver enough juice to charge...
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  • replacement Breakaway Kit Battery for Engager System and Solar Panel and Charger for Battery
  • We do have replacement batteries for the Hopkins Engager breakaway system # 20099. You would use # HM20008. It is indeed a 12 volt battery. Current pricing for this and any item is available on the product page. The Engager system or any breakaway system with a charger will only work to charge the battery when connected to a tow vehicle with a functioning 12 volt circuit in its trailer connector. If the battery is depleted or not fully charged then it will take time to charge it up...
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  • Should a Trailer Breakaway Battery Be Brought inside When Trailer is Winterized
  • It would be a good idea to bring your breakaway battery inside and put it on a trickle charger if it's going to be parked for a while in the bitter cold. An inactive battery will slowly lose it's charge over time, especially in the cold. For a charger with pulse maintenance that would do an excellent job keeping your battery in good condition for the winter you would want the CTEK Multi US 4.3 # CTEK56864. For the man door you have you could use the # SL716SS installed on the inside...
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  • CTEK Battery Charger Recommendation for Motorcycle Battery
  • CTEK is a great company and they make high-quality battery chargers that I highly recommend. A CTEK charger will serve the exact purpose you are looking to fill. It sounds like the MULTI US 4.3 # CTEK56864 will fit the bill. This charger comes with eyelet-terminal cable that can be permanently attached to the battery terminals on your motorcycle battery. The MULTI US 4.3 has a pulse-maintenance stage that will help maintain the battery's change while it is plugged in. To best fit the...
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  • Indicator Lights on CTEK Multi US 4.3 12-Volt Battery Charger # CTEK56864 Do Not Change
  • I own and use this same # CTEK56864 charger on my motorcycle and lawn mower batteries, both of which are only about 2 years old. Usually the first two or three LEDs light up after only a few minutes of charging. After nearly 10-hours of charging definitely more than one LED should be illuminated. A 4-year-old battery could be at the end of its life. Two weeks ago I had to replace the original battery in my wife's 2008 Ford Escape after just over 4-1/4 years of service. Battery life...
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  • Parts Needed to Charge Battery of 5th Wheel Trailer While Towing Through 7-Way
  • If you have a 7-way trailer connector the pin in the 1:00 position carries the 12 volt accessory circuit which is what normally charges a trailer battery. It would need to be ran to the positive post of your battery though. You should note that this will only really provide you with a maintenance charge for the battery and won't keep a large battery charged if depleted. I attached a diagram that shows how 7-ways normally run to brake controllers and batteries. If you need a charger...
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  • Would Vehicle Battery Drain if Trailer Wiring Is Installed
  • The Curt T-Connector Vehicle Wiring Harness # C56183 if left installed on a vehicle like your 2012 Jeep Liberty should not be draining the battery. If the 4-way connector isn't powering anything there wouldn't be any draw on the battery. That being said, if a vehicle isn't driven for a few weeks there is good chance the battery will be drained. Especially in cold weather. You might just need to put your vehicle battery on a maintenance charger like the part # CTEK56864 when you are...
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  • How to Charge Dual 80-Amp-Hour Trailer Batteries While Driving
  • A 12VDC power feed from a vehicle 7-way trailer socket will deliver enough current to a trailer battery to maintain it - to top it off - but not enough to charge it if it becomes depleted. A depleted battery will need to be recharged with a device like the CTEK # CTEK56864 MULTI US 4.3 Universal 12-Volt Battery Charger. This unit draws 121 watts when delivering a full charging current, according to my contact at CTEK, so it would be compatible with the 150-watt output of your Tacoma's AC...
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  • Options for Mating 4-Pole Flat Vehicle Wiring to Jayco 6-Pole Square Trailer Wiring
  • The 4-pole to 6-Pole Jayco wiring adapter # 30104 supports only the 3 circuits on the 4-pole but converts them to the connector format used on older Jayco trailers. A 4-pole wiring setup has a ground and three circuits; right stop/turn, left stop/turn and tail lights. The Jayco connector has a ground and 5 circuits so using this adapter would let the basic lighting signals from the Explorer's 4-pole reach the trailer but the other functions supported by the Jayco plug would NOT have any...
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  • Why Would Phase 3 of CTEK Charging Go Quickly but Phase 4 Go Slow
  • Stage three is the bulk stage of the charging cycle for the CTEK battery charger part # CTEK56864. If this phase went by quickly it is most likely due to your battery being nearly fully charged as it sat. Stage 4 is the absorption phase, this is a slow process on purpose so that the battery gets a diminished charge to top the battery off in the best way possible. This phase helps the battery hold the charge that it has by not overcharging. The two phases aren't totally dependent on each...
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  • Can Factory Trailer Wiring Harness on 2015 Porsche Macan Deliver 40-Amps Current for Chair Lift
  • Since we do not sell the OEM wiring harness that was factory installed in your 2015 Porsche Macan you can determine its amperage capacity by checking with your dealership or by seeing what value fuse is associated with it. It is NOT likely that the wiring harness can deliver 40-amps especially if the vehicle uses low-power-demand LED lighting. You'll also want to confirm the actual power draw from the lift's motor; is the 40-amps continuous or peak current draw? Tri-Lift offers several...
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  • Which Mode Can Be Used With CTEK Battery Charger For Motorbike Battery
  • I called my contact at CTEK and asked about the modes you mentioned in your question. My contact said the RECOND mode is used for batteries that no longer hold a charge and is not used for a normal-functioning battery. They told me that the charger like part # CTEK56864 can be left on all the time and it will go into a pulse maintenance mode which will keep the battery charged when unattended. My contact said they put their charger on AGM mode and they never take it off that unless...
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  • Correcting Dead Battery in Trailer Breakaway System
  • Chances are that your breakaway battery fully discharged during the overnight period when it was accidentally engaged. Breakaway batteries are rated to deliver 15-minutes of power in an emergency stop. You can try re-charging it with a battery charger like # CTEK56864 from CTEK. I own one of these and it does a good job on my mower and motorcycle batteries. If a charge does not correct the problem then you can use Replacement Sealed Lead Acid Battery # TK2023 or Replacement Breakaway...
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  • Battery Charger Option for a 2002 Corvette C5 Red Top Optima Battery and Deep Cycle Trailer Battery
  • After doing some research on the red top Optima Batteries for your 2002 C5 Corvette, the CTEK 0.8 Universal Battery Charger for Small 12 Volt Batteries # CTEK56865 will maintain a charge on your vehicle battery. This charger should also be able to maintain the charge on your deep cycle trailer battery as long as it has a capacity less than 100 amp hours. This charger can maintain batteries with capacities up to 100 amp hours, but will only charge batteries with capacities from 1.2 to 32...
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  • Isolation Solenoid Recommendation for Battery Charge Circuit of Trailer
  • You will want to install the isolation solenoid part # TR118665 on the 12 volt accessory circuit of your 7-way so that it only is active when the truck is on. This will prevent backfeeding when you use a charger like the CTEK part # CTEK56864 when you are charging the vehicle battery. I attached a picture that shows how to wire up the solenoid as well.
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  • Troubleshooting Non-Functioning Electric Trailer Jack Motor
  • Thank you for providing details about your troubleshooting efforts with your electric jack. The first thing to make certain of is that the battery installed on the trailer to power the jack is rated appropriately for the jack's current requirements. Some jacks require more current than others. For instance, Husky A-frame jack # HT87247 will need 25-amps of current to lift its 4500-lb rated maximum while the less-efficient Stromberg Carlson jack # JET-3755 will require 30-amps. Next...
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  • Trailer Wiring to Allow Trailer Battery to Charge from Tow Vehicle
  • The Hopkins 7-Way Molded Trailer Wire Connector # H20046 could be used to connect your trailer's battery to your tow vehicle by using just the black (+12V) and white (ground) wires. However, the wiring in a tow vehicle cannot really deliver enough amperage to charge a trailer battery. These +12V feeds are intended to maintain a charged battery, but not to charge a depleted one. Battery chargers such as the CTEK # CTEK56864 include several wiring harnesses one of which could be installed...
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  • Charging Time for Trailer Battery Used to Power Electric Tongue Jack
  • A trailer-mounted battery that is used to operate a powered tongue jack could require an overnight charge on a shore-power charger like the CTEK # CTEK56864 if it has been fully depleted. Exact time depends on the battery capacity. The 12V power feed on a trailer 7-way connector delivers enough current to maintain a charged battery but not enough to re-charge one that has become depleted. For that you need a shore-power charger powered on AC current. Once fully charged the 7-way 12V...
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  • Installing Hopkins Engager Trailer Breakaway System Without Power From Tow Vehicle
  • Due to the extreme importance of having a functional trailer breakaway braking system, I can't recommend installing it in any other way than what's recommended by Hopkins. When you're not running down the road, you can certainly use a charger like the CTEK # CTEK56864 to keep the battery maintained, but it really needs to be installed by the book when you're towing. If your fear is that the draw of the battery charging circuit will deplete the tow vehicle battery, the charger on the...
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  • Takes Hours for Battery to Get Back to 100% with CTEK Universal 12-Volt Battery Charger # CTEK56864
  • I spoke with my contact at CTEK and he said that as long as you have a battery that is in great condition, it should typically take less than 15 minutes and never more than a hour for the battery to get back to 100% just after unplugging the CTEK MULTI US 4.3 Universal 12-Volt Battery Charger with Pulse Maintenance, # CTEK56864, or cycling through the modes. My guess is that there is a problem with the battery that you are charging. I recommend trying the charger on a different battery...
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Info for this part was:

Test Fit:
Joe V
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Expert Research:
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