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Battery Chargers > Battery Charger > 4-Step Charger > 12 Volts > CTEK Power Inc


CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse Maintenance

CTEK Power Inc Battery Chargers

ratingratingratingratingrating (13 reviews)


Code:   CTEK56158

Retail:$74.99

Price:$69.99


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Shipping Weight: 2 pounds

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CTEK Power Inc Battery Chargers - CTEK56158

This powerful, all-weather, four-step charger uses a patented, pulse-maintenance system to charge and maintain all household 12V batteries - cars, campers, mowers, trucks and boats. A practical battery charger fits most applications.

Features:

  • Reliable, maintenance-free, 4-step system constantly monitors and maintains 12V battery charge
    • Won't overcharge or undercharge like common trickle chargers
    • Switches automatically to pulse-maintenance phase when full charge has been reached
    • Reduces risk of overheating, sulfation and premature battery failure
  • Easy-to-use, quick-disconnect system
    • Includes 2 battery-cable attachment systems w/ 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, versatile design
    • Approved for indoor and outdoor use
    • Prevents reverse-polarity mistakes
    • Offers (3) 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 designed for charging and maintenance in cold weather; also recommended by many AGM battery manufacturers like Optima, Maxima and Odyssey
  • Convenient accessories (sold separately) provide additional security and convenience
    • Know your battery's charge level at a glance w/ optional LED-indicator battery cable
    • Reduce the hassle of charging multiple vehicles w/ additional battery-hookup cables


Specs:

  • Application: most starter and deep-cycle, 12V, lead-acid batteries - including wet, MF, AGM and most gel batteries
    • Charges batteries w/ capacities from 1.2 Ah - 75 Ah
    • Maintains batteries w/ capacities up to 120 Ah
  • Charge cycle: 4-step, fully automatic charger w/ pulse maintenance
  • Dimensions: 6.5" long x 2-3/8" wide x 1.5" tall
  • Includes:
    • 12V Battery charger (w/ 5' battery-connection cable and 6' power cord attached)
    • 1 Set of 16" battery cables w/ battery-terminal clips
    • 1 Set of 16" battery cables w/ M6 (6.4-mm) eyelet terminals
    • Owner's manual
    • Protective case
  • 5-Year warranty
CTEK MULTI US 3300 bulk charging time chart

This CTEK charger comes w/ two battery cables: one w/ clamp terminals and one w/ 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 3300 Charger w/ 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 3300 Charging Process

Safe, four-step process uses switch-mode, pulse-maintenance technology.

  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. Bulk stage is the main charging phase. This stage accounts for 80 percent of the charging process and uses a constant charge level.
  3. Absorption stage completes the charge (to virtually 100 percent) using diminishing current to prevent battery damage.
  4. Pulse-maintenance stage begins 18 hours after the battery is fully charged. In this stage the charger maintains the battery at the optimum charge level of 95 to 100 percent by recognizing any drop in voltage and sending a corresponding pulse of current to keep the battery properly charged. Pulse maintenance can be continued for months at a time.
CTEK MULTI US 3300 charging process chart

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!

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 scientifically engineered to safely charge your battery by employing the most up-to-date technology. Using carefully monitored, low-grid voltage, CTEK's patented process differs from competitors' chargers in its ability to provide the precise final voltage that your battery needs to maintain optimum charge level. This sophisticated, interactive device will never overcharge or undercharge your battery. You may leave it attached to the battery for months, making it perfect for seasonal vehicle storage.

Won't cause overcharging or overheating. These together can cause gassing and excessive acid concentration that shortens the life of the battery by corroding the lead plates. When overcharged, the battery cells become dried out. Electrolytes "boil dry," generating excessive heat that can 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 w/ 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 w/ 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, it also includes a desulfating step that can often "revive" a lightly sulfated battery. It accomplishes this w/ carefully monitored electronic pulses of energy that help to break down the lead sulfate crystals, allowing the battery to accept charge once again.

Ensures consistent charging w/ low ripple-wave percentage rate. Ripple-wave percentage is the quantity of disturbances exhibited in current and voltage. Even minor variations in household current can cause undercharging or overcharging, but CTEK's low-ripple design regulates the incoming current before passing it on to your battery. This process can cause the charger to be a little slower than linear chargers but results in a healthier, more productive, longer-lasting battery.



Protects the Vehicle and Its Electronics

The charger is also safe for your vehicle. Its sophisticated circuitry is designed to be compatible w/ 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 w/ 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.



CTEK MULTI US 3300 indicator chart

Indicator lights on the face of the charger light up to show the current charging stage.


Additional Specs:

  • Model: 56-158 (MULTI US 3300)
  • Input voltage: 100 VAC - 120 VAC, 50 Hz - 60 Hz
    • Output power is reduced at lower input voltage; a perfect charge will still be achieved
  • Current: 1.1A rms (at full charging current)
  • Charging current: 0.8A - 3.3A max
  • Back current drain: 1.3 mAh per month
  • Charging voltage: 14.4V - 14.7V
    • Nominal charging voltage: 12V
  • Ripple wave: less than 2 percent variance (max 50 mV rms, max 0.13A)
  • Battery cable fuse: 15A
  • Ambient temperature: -4 degrees F to +122 degrees F
    • Automatic reduction of power at increased ambient temperature
  • Cooling: natural convection
    • Do not cover the charger


56-158 CTEK MULTI US 3300 12V 4-Step, Pulse-Maintenance, Lead-Acid Battery Charger





Video of CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse Maintenance


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

Video Vendor Information Ctek
CTEK Battery Charger Vendor Information
Video install ctek universal battery charger 2013 mercedes benz sprinter ctek56158
CTEK Multi US 3300 12-Volt Universal Battery Charger Review

Video Transcript for CTEK Battery Charger Vendor Information

CTEK was founded in Sweden. Basically our parent company is a prototyping company. Prototypes everything from plastics to electronic equipment right down to batteries but we actually consider ourselves a battery company with out batteries. We know everything about them. How to make them last longer and perform better. We just deal with the charging and maintenance end of it. 00:18

We have a patented mode of charging for one thing that we go through. Ultimately what this is going to do is bring our battery up to charge and then shut off completely versus your traditional trickle mode or linear charge like others might do on the market. If you could actually see current and voltage what you would see with those traditional charges you are putting in the same current and voltage high amperage level. We actually consider those toasters a lot of times because they generate more heat than charge and ultimately can toast the battery if not used properly or left on too long. 00:45

We have a patented mode of charging for one thing that we go through. Ultimately what this is going to do is bring our battery up to charge and then shut off completely versus your traditional trickle mode or linear charge like others might do on the market. If you could actually see current and voltage what you would see with those traditional charges you are putting in the same current and voltage high amperage level. We actually consider those toasters a lot of times because they generate more heat than charge and ultimately can toast the battery if not used properly or left on too long. 00:45

We realize that nobody cares about their battery. It is an evil that nobody wants to see and unfortunately nobody cares about it until it is too late and there is a problem where your vehicle does not start or your batteries are discharged to the point where you need to replace them. With our add on series, the comfort indicator, we have simply made your battery visible now. It is a one time installation. You bolt it directly to the battery with the flashing LED lights in there at all times visible you know where your battery stage of charge is at and if you need to charge it. Everything about our charger is we try to make it really safe, easy to use, and very functional. That is part of the quick connect and comfort indicator series that we have launched. Basically the concept behind it is you can have your one time installation on the battery especially with the comfort indicator series with the LED lights in it, now your battery is actually visible. You know at all times when you need to charge your battery and then it is pretty easy to use basically and you can balance your charger from vehicle to vehicle as you need to charge. 02:07

We like to think we have the best charger on the market. We try to stay ahead of the curve with the technology that we are putting into the battery chargers. CTEKs all are back by five year no questions asked warranty. Every household needs one of these chargers. It is a very robust design and it absolutely works on everything. From your lawn tractor, your boat, your RV, your motorcycle, your sports car. It is a very indispensable product to have.


Customer Reviews

CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse Maintenance - CTEK56158

Average Customer Rating:  ratingratingratingratingrating4.8 out of 5 stars   (13 Customer Reviews)

This powerful, all-weather, four-step charger uses a patented, pulse-maintenance system to charge and maintain all household 12V batteries - cars, campers, mowers, trucks and boats. A practical battery charger fits most applications.


- CTEK56158

ratingratingratingratingrating by: Bob etrailer employee11/14/2013

Is this review helpful?


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






- CTEK56158

ratingratingratingratingrating by: Kevin12/26/2012

Is this review helpful?


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

ratingratingratingratingrating by: Joel B.06/30/2011

Is this review helpful?


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






- CTEK56158

ratingratingratingratingrating by: Robert LaBonte10/08/2013

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






- CTEK56158

ratingratingratingratingrating by: Triple D Ranch07/22/2013

Is this review helpful?


thank's work's good 90944




Reviews for other 12-Volt Universal Battery Charger :

- CTEK56864

ratingratingratingratingrating by: Adam R. - etrailer.com Employee01/20/2014

Is this review helpful?


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






- CTEK56353

ratingratingratingratingrating by: Todd06/07/2011

Is this review helpful?


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






- CTEK56864

ratingratingratingratingrating by: David04/08/2013

Is this review helpful?


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

ratingratingratingratingrating by: Barney B05/24/2014

Is this review helpful?


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 etrailer.com. 132255






- CTEK56864

ratingratingratingratingrating by: Dan S.12/20/2013

Is this review helpful?


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

ratingratingratingratingrating by: AD03/25/2013

Is this review helpful?


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






- CTEK56864

ratingratingratingratingrating by: Ted C.11/28/2012

Is this review helpful?


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






- CTEK56864

ratingratingratingratingrating by: R Hochnadel02/20/2014

Is this review helpful?


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




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Ask the Experts about this CTEK Power Inc Battery Chargers
Expert Answers about CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse Maintenance - CTEK56158                                         Do you have a question about this Battery Chargers?


  • 12 Volt DC Battery Charger Recommendation for Charging an Auxiliary Battery with a Truck
  • This Tekonsha Two Stage 12 V DC Battery Charger, part # 2024-07, is designed to charge 12 volt systems while being used on a 12 volt power source like your truck has. However, the # 2024-07 is designed for maintaining smaller batteries that go through extended periods of not being used. It is not designed to charge a larger vehicle battery like the one you have in your truck. I would recommend you use a CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse Maintenance, part...
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  • How To Maintain Trailer-Mounted Winch Battery Using 12-Volt Accessory Feed
  • First, on the towing vehicle, you will need to install a battery isolator, # TR118665. The flow of current will go from the vehicle battery to the isolator. From the isolator it will go along a length of 12 gauge wire, # 12-1-1, to the vehicle side trailer connector via a 30 amp circuit breaker. Next, 12 gauge wire will need to run from the trailer side 7-Way to the positive Trailer battery terminal. If the winch came with a circuit breaker it will need to go between the winch and positive...
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  • Battery Charger for a Trailer Battery on a Dump Trailer
  • For your larger battery, I do recommend the CTEK MULTI US 3300 12-Volt Universal Battery Charger, part # CTEK56158. This charger is designed for larger batteries like the one on your trailer. This being said, you could also use the 12-volt accessory circuit on your 7-way trailer connector to maintain the battery on your trailer. Be sure to follow any battery manufacturer instructions regarding battery charging.
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  • Charging a Trailer Breakaway System Battery Using the 12 Volt Circuit on a 7-Way Connector
  • To charge the battery in the Engager Trailer BreakAway Kit, # 20099, you can attach the wire from the 12 volt circuit on the trailer side 7-Way (1 oclock position on the back of the trailer side 7-Way where the wires attach) to the input wire on the trailer breakaway system. This system has a charger built in to it. As long as it is connected to a function 12 volt circuit it will charge the battery. When connected to the towing vehicle and the vehicle on and/or running, the 12 volt circuit...
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  • How To Charge Trailer Battery On Dump Trailer Using The 7-Way Trailer Connector
  • You will want to use a circuit tester like the Quickee Tester, # 3808, and check the # 4 terminal on the back of the 7-way trailer connector on your trailer for power. This is the 12 volt power terminal so there should be power to that terminal. You will need to run a 10 gauge power wire like the, # 10-1-1, from the # 4 terminal (12 volt) on the 7-way trailer connector on the trailer to the positive terminal on the trailer battery. This will allow you to maintain a charge on your trailer...
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  • Can a 7-Way Trailer Connector Be Used To Charge the Trailer Battery
  • The 12 Volt auxiliary terminal on your 7-way connector can be used to keep the battery on your trailer charged. You will need to run a 10 gauge power wire like # 10-1-1 from the 12 volt auxiliary terminal on the 7-Way trailer connector on the trailer to the positive terminal on the trailer battery and ground the negative terminal of the trailer battery to the trailer frame. This will allow you to maintain a charge on your trailer battery, it will not charge the battery from a discharged...
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  • Adding a Battery and Wiring to a Non-Powered Trailer to Add Interior Lights to an Enclosed Trailer
  • The first thing you will need is a battery and a battery box. The wiring for the light will need to be connected directly to this battery via a switch that you can get at a hardware store if the light does not already have a switch. Or you can install a new light that has a switch like the Trailer Dome Light with Switch and Aluminum Base, # IL61CB. Mount the switch in the trailer, route the wiring from the light to the switch, and then from the switch to the battery. If the light is...
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  • How to Charge, Maintain and Wire a Winch Battery, Wiring Front of Truck to Trailer
  • Running a charge line from a vehicle charging system for charging a trailer mounted battery can be accomplished but the vehicle charging system does not have enough power to charge a battery that distance away from a discharged state. The charge line is only capable of maintaining a sufficiently charged battery while the vehicle is running. In your case you have two options. The easiest is to use a battery charger like the CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse...
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  • How to Charge Multiple Optima Batteries with the CTEK 7002 # CTEK56353 Battery Charger
  • I Contacted CTEK to be sure that I could give you the correct information on charging your 4 Optima Yellow Top batteries. He said that as long as the batteries are connected in parallel, still a 12 volt system, you can use the CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance and Backup Power, item # CTEK56353, to charge all 4 batteries at the same time. He also stated that the CTEK MULTI US 7002, is the charger that they recommend for the Optima Yellow Top and is...
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  • No Power To 7-Way Vehicle Connector on 2008 Nissan Pathfinder After Tow Wiring Harness Installation
  • On your 2008 Nissan Pathfinder the Towing Relay 2 fuse is the brown relay, like the Valley Large Brown Relay, part # V38937-1.This relay will activate the 12-volt power circuit on the 7-Way connector. This relay is located in a fuse box under the hood, next to the vehicles battery. Next to the brown relay will be Towing Relay 1 (blue) which should be installed to activate the running lights and signal for the 4-pin towing harness. To charge a trailer battery from the 7-Way you should...
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  • Can a Trailer Battery be Directly Connected to the 12 Volt Circuit on a 7-Way Connector
  • First, you can connect the 12 volt circuit directly to the trailer battery. However, the wiring in the trailer wiring package is not able to charge up the battery, it can only maintain its current charge level. To up charge the battery, you would need to use a battery charger like # CTEK56158. Having a hot 12 volt circuit when the trailer is disconnected is not going to be a problem but if you want to be absolutely sure there is no power loss or back feeding issues, I would recommend...
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  • Will the CTEK DC Battery Charger Help to Bring an Auxiliary Optima Yellow Top Battery to Full Charge
  • You are correct, that an alternator is not designed to fully charge a depleted battery. In your case the Optima yellow top is being significantly discharged and will eventually need to be charged with a good battery charger like the CTEK MULTI US 7002, # CTEK56353, or the CTEK MULTI US 3300, # CTEK56158. The CTEK Battery Charger, item # CTEKD250S, can be used to boost the charge that your alternator is sending to the second, yellow top, battery that you are using to power the fridge....
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  • How Long Will the Engager Trailer Breakaway Kit Battery Last Without a Charge
  • Battery life depends on so many factors that it is hard to quantify the life any given battery. I spoke with my contact at Hopkins and he stated that if the battery is stored outside he estimates a 3 to 6 month life span. If stored inside it will last a little longer and will most likely make it to 6 months. If the battery is not being charged via the 7-Way trailer connector regularly then it is recommended to charge the battery every 3 months using a battery charger like # CTEK56158. If...
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  • Can 12 Volt Accessory Circuit on a 7-Way Trailer Connector be Used to Maintain a Deep Cycle Battery
  • The 12 volt accessory circuit on a 7-Way can maintain a battery, it just will not be able to charge it. Since we are talking about maintaining a charge, a regulator will not be needed since the 12 volt accessory circuit does not have the capacity to charge the battery. So it will not overcharge any of the cells. Since a deep cycle battery is designed to discharge most of its charge at once, I would recommend connecting the 12 volt accessory circuit first to a 40 amp circuit breaker,...
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  • Installing a Battery on a Trailer and Wiring it to Run Interior Trailer Lights
  • I recommend a 12 volt car battery rather than a breakaway battery because you may end up needing the larger battery down the road. What you will do is attach a battery box (see link for options) to the trailer frame. From the trailer side 7-Way connector, there will be a wire attached to the pin in the 11:00 position (if looking at the face of the plug). This is the 12 volt circuit. You can attach that to the positive terminal of the battery. It will maintain the battery but it will...
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  • 2006 GMC Sierra Trailer Wiring Not Supplying Battery Charge on a 2005 Slide in Camper by Six Pac
  • If you have a 7-Way connector on the rear of your 2006 GMC Sierra, the number 4 contact, in the 1 o-clock position, looking inside the connector from the rear of the vehicle, should be the 12 volt hot wire contact (see link). Check this contact with a circuit tester, item # 3808 if needed. If you do not have power to this contact then you will need to determine if there is a blown fuse. This fuse is under the hood in the power distribution box (see link). There should be a 40 amp fuse in...
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  • When Using a Battery Isolator Prevent the Trailer Battery from Draining the Vehicle Battery
  • The isolator # TR118665 will only send power back on the output wire when the ignition source is energized (vehicle is running). This will prevent the trailer from drawing power from the vehicle battery or back feeding to the vehicle battery and will also maintain the charge level of the battery (when the vehicle is running). However, you will not be able to charge up the trailer mounted battery. For that you are going to want to use a battery charger like # CTEK56158. If you are just...
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  • Can a CTEK Battery Charger be Used to Charge a Deep Cycle Battery While Using Lighting in a Trailer
  • Yes, you can use the CTEK US 3300 12-Volt Battery Charger, item # CTEK56158, to charge a battery while using the lights in the trailer. One thing to keep in mind is that the smaller battery charger will not be able to keep up with the lighting use in the trailer and the battery will eventually be drained, if not allowed to charge when the lights are not being used. It will not harm the charger. A better option is a charger that has a supply mode. The CTEK MULTI US 7002 12-Volt Universal...
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  • Battery Charger for Maintaining the Charge on a 2005 Ford Excursion Diesel with 2 Odyssey Batteries
  • The CTEK Battery Charger, item # CTEKD250S, is designed to charge an auxilliary battery form the vehicle alternator output or from the starting battery on the vehicle. This charger would not work for your application unless you have a solar panel that can be ran to the positive input side of the # CTEKD250S charger. In that case the solar power can be used to help maintain the vehicle batteries and keep them from overcharging while you are away from the cabin for extended periods. If...
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  • 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...

  • Can the CTEK Battery Chargers Resurrect Nearly Dead Trailer Break Away Batteries
  • The CTEK US 3300 12-Volt Battery Charger, # CTEK56158, may be able to resurrect your batteries but if they were dead long enough, they would probably be too far gone to bring back to working order. The best bet for this scenario would be the CTEK MULTI US 7002 12-Volt Universal Battery Charger, # CTEK56353, because it has a special reconditioning mode that restores the power capacity of stratified batteries. The 7002 also has an 8-step charging process.
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  • What is the Life Expectancy of a Break Away Battery for a Trailer Break Away System
  • There are so many factors that can be attributed to battery life that a hard number of years for the life span of a Breakaway Battery like # HM20008 is nearly impossible to determine. In cold weather climates like in the northern United States, the cold will take its toll on the battery and it will not last as long. The same is true for hot climates such as in the Southwestern United States. And there are also marine areas, and/or areas that see a lot of rain. In addition to weather...
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  • Can the Breakaway Battery Charger on a Car Hauler be used to Charge a Large Winch Battery
  • Using the breakaway battery charger to charge another battery on the trailer is not recommended. The larger battery you are using to operate the trailer winch would take an extremely long time to charge with a breakaway charger and would likely never charge fully with the limited amount of time the trailer is connected to the vehicle, even if towing long distances. The breakaway battery may not be charged sufficiently in this situation either. The best bet for charging the winch battery...
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  • Can the CTEK MULTI US 3300 12-Volt Universal Battery Charger be Used on a 12 Volt 2 Battery System
  • Yes you can use the CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse Maintenance, item # CTEK56158, on your vehicle with two batteries. Just attach the cable with eyelets as you would to charge or jump your batteries. Connect the positive lead to the positive post on one battery and connect the negative lead to the second battery negative battery cable connection at the vehicle frame or engine block. This charger maintainer has smart technology that will not allow it to overcharge...
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  • Acceptable Methods of Providing Power to Trailer Jack Mounted on Horse Trailer
  • You can either power the jack through the accessory circuit on the 7-way or via an auxiliary battery installed on the trailer. If you decide to power the jack through the accessory circuit, it is advisable to use a jack whose capacity greatly exceeds the tongue weight of your fully loaded horse trailer. If the jack is working very hard to lift the trailer, the wire that carries the accessory circuit can overheat. To provide plenty of wiggle room, I would say that if the capacity of the...
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  • Using 7-Way Accessory Circuit to Maintain Trailer Mounted Battery
  • That is a great question. The 12-volt accessory feed from the 7-way CAN be used to maintain your trailer-mounted battery during travel, but it will NOT recharge a battery from a depleted state. To charge a depleted battery, a charger like the # CTEK56158 CTEK Universal Battery Charger can be used. The 10 or 12 gauge wire used in the accessory circuit will prevent enough current from going through to worry about overtaxing or damaging the alternator. To prevent the trailer mounted battery...
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  • How To Charge Trailer Battery From a Chevrolet Silverado With a 7-Way Connector
  • To keep the trailer battery charged you will need to run a 10 gauge power wire like the, part # 10-1-1, from the 12 volt power pin (# 4 terminal at 11:00 position) on your trailers 7-way connector, to the positive terminal on the trailer battery. Now when the trailer is connected and you are towing, the tow vehicle will provide a maintenance charge to the trailer battery. It will not charge the battery from a discharged state. You will want to test the # 4 terminal at the 1:00 position...
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  • Will CTEK Battery Charger Charge Battery Without Damaging It?
  • If the car battery is merely discharged but otherwise in good repair, using a CTEK charger will not damage it. CTEK chargers will not over charge a battery, once full charge is reached, the charger switches to pulse maintenance, which maintains the charge rather than applying full power to the battery. A charger like the CTEK Multi US 3300, part # CTEK56158 would be best suited for a car battery. The charger is suitable for deep-cycle batteries. This charger features three modes, one...
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  • CTEK Battery Charger Does Not Stay in Desulfation Stage for More than a Few Seconds
  • There is no set time for each charging phase for CTEK battery charger # CTEK56353. If the battery is at or above the terminal voltage preset level then it will go on to stage 2. This would mean that the battery does not necessarily have sufficient lead sulfate crystals that need to be converted back to sulfuric acid. Also, on batteries that are completely dead or have excessive sulfation, the charger will not be able to resurrect it. Check to make sure that the connection points on the...
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  • 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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Info for this part was:


Test Fit:
Joe V

Expert Research:
Michael L

Video by:
Andrew K

Expert Research:
Patrick B

Expert Research:
Michael H

Expert Research:
Jameson C

Expert Research:
Rachael H

Video Edited:
Chad S

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