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CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance and Backup Power

CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance and Backup Power

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This powerful, all-weather eight-step charger uses a patented, pulse-maintenance system to charge, maintain and help recondition 12V batteries. Backup power supply allows you to change vehicle batteries without losing complicated program settings. 1-636-306-4830 to order CTEK Power Inc battery charger part number CTEK56353 or order online at Free expert support on all CTEK Power Inc products. Guaranteed Lowest Price and Fastest Shipping for CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance and Backup Power. Battery Charger reviews from real customers.
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CTEK Power Inc Battery Charger

  • Car/Truck/SUV
  • Motorcycle
  • Trailer
  • Lawn Mower
  • Jet Ski
  • Battery Charger
  • 12V
  • Wall Outlet to Vehicle Battery
  • CTEK Power Inc
  • Charges/Maintains
  • 150 Ah

This powerful, all-weather eight-step charger uses a patented, pulse-maintenance system to charge, maintain and help recondition 12V batteries. Backup power supply allows you to change vehicle batteries without losing complicated program settings.


  • Reliable, maintenance-free, 8-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
    • Makes use of an internal power supply during battery changes to preserve your vehicle settings
    • Restores the power capacity of stratified batteries w/ special Reconditioning Mode
  • 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
  • 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


  • Application: most starter and deep-cycle, 12V, lead-acid batteries - including wet, MF, AGM and most gel batteries
    • Charges batteries w/ capacities from 14 Ah - 150 Ah
    • Maintains batteries w/ capacities up to 225 Ah
  • Charge cycle: 8-step, fully automatic charger w/ pulse maintenance and Reconditioning Mode
  • Dimensions: 8-1/2" long x 3-1/2" wide x 1-7/8" 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/ M10 (10.5-mm) eyelet terminals
    • Owner's manual
    • Protective case
  • 5-Year warranty

CTEK MULTI US 7002 bulk charging time chart

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

CTEK MULTI US 7002 wiring cable w/ 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.

CTEK MULTI US 7002 wiring cable w/ clamp terminals

CTEK MULTI US 7002 Charging Process

Superior and safe, this eight-step process (plus Supply Mode) 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. 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 lighting 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 w/ a constant current of 1.5A and a 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. This long-term stage 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.

Supply mode - available only on this CTEK model - provides backup power to your vehicle while the battery is being changed. No more tiresome system resetting after battery changes.

CTEK US 7002 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! CTEK's low ripple rate eliminates the danger of damaging electronic devices connected to the battery, and it prolongs the battery's service life. If you must replace your battery, the Supply Mode provides backup power to your vehicle's systems when you remove or replace the battery, sparing you the hassle of resetting your controls.

Closeup of indicator panel w/ descriptions

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

Additional Specs:

  • Model: 56-353 (MULTI US 7002)
  • 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
  • Maximum current demand 2.0A rms (at full charging current)
  • Charging current: 7A max
  • Back current drain: less than 3 mAh per month
  • Charging voltage: 15.7V
    • Nominal charging voltage: 12V
  • Ripple wave: less than 2 percent variance (max 150 mV rms, max 0.3A)
  • 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

56-353 CTEK MULTI US 7002 12V 8-Step, Pulse-Maintenance, Universal, Lead-Acid Battery Charger

Item # CTEK56353

Installation Details CTEK56353 Installation instructions

Customer Reviews

CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance and Backup Power - CTEK56353

Average Customer Rating:  4.9 out of 5 stars   (84 Customer Reviews)

This powerful, all-weather eight-step charger uses a patented, pulse-maintenance system to charge, maintain and help recondition 12V batteries. Backup power supply allows you to change vehicle batteries without losing complicated program settings.


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

Still works great, no issues.
Mike N - 04/03/2016


We have used the C-Tek chargers for many years for vehicle prototype development, and it is the only brand and model that we use.
Our normal supplier did not have this item in stock.
I searched online for someone who could supply our needs as we were behind on a project.
Etrailer had this item in stock. They offered great customer service and fast shipping. We ordered 4 chargers.
We will start using in the future for the C-Tek and other items.

Scott - 02/28/2019


This charger has worked flawlessly on a set of 4 golf cart batteries paired in series for a 12 volt system used on my RV. It is easy to operate and durable. Instructions are easy to understand. The easy clip exchange between battery clips vs. screw down rings makes it easy to switch over to other batteries, such as for my boat, for a quick charge.


Great perfectly


I purchased a C Tek battery charger and it is much more advanced than the
Battery Tenders that I have used for years. While the Battery Tenders do a
good job of keeping a battery up, the C Tek can in some cases restore a battery
that is sulphated. I like it as it is also a power supply if you want to change
your battery and not loose the settings in your car.


I purchased this same unit about 10 years ago and have had good experience with it. It is still in good working order so when I developed the need for an additional unit I opted for the same mfg.
My only concern is ordering from an authorized distributor in order to maintain the mfg warranty.
Ordering from etrailer web site was a little confusing at the point of placing the order and I wasn’t sure if the order was actually submitted until I received a confirmation later that day.
Delivery time was out the door same day. I would order from this distributor again in the future.


Without a doubt the best charger I have ever owned. I use this charger on all three of my vehicles. Plus my motorcycle and garden tractor.
Just wish there was an accessory that allowed me to charge both batteries on my diesel truck at the same time.


Great chargers. Seems like the plastic used in the proprietary connectors could be better quality. Otherwise doing a great job keeping batteries in good shape.


Works well & the display provides a good status of progress being made in charging. I used on my RV with 3 12V batteries


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.


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.


Excellent product - replaced a CTEK 3300. I will likely replace 3 more CTEK 3300 with the CTEK 7002. Great service by Shaun on the phone who enabled shipping overnight when I really needed it. Very courteous and professional. Thank You !!!


After destroying several batteries with other brands, I only use CTEK .


Like that it has connections to charge various types of batteries. First use was a camper battery and it charged quickly. etrailer has always provided good service also.


Product is as advertised and customer service/delivery is great. I would recommend this company to anyone


I have had great luck with Ctek chargers.

E-trailer is always a great vendor tobpurchase from.


Been using this charger for a year now, and it has worked like a charm. money well spent


This little device has been a game changer.....easy to install, easy to use - recommend!


Great charger at a great price. Delivery was as scheduled complimenting the great service.


Have not had the chance to use it but I like the advance technology. Better than the rest.


Good product


Excellent product but Made In China. r>


Works well


Very good product at very good price


Show More Reviews

See what our Experts say about this CTEK Power Inc Battery Charger

  • Maximum Power Consumption for CTEK MULTI US 7002 12-Volt Universal Battery Charger CTEK56353
    The CTEK MULTI US 7002 12-Volt Universal Battery Charger # CTEK56353 will draw a maximum power input of 2-amps during charging according to my contact there. I own one of these CTEK chargers and for several years it has worked reliably to maintain my lawn mower and motorcycle batteries. The CTEK's output is sufficient to charge batteries from 14 to 150 Amp Hours (Ah) and it can maintain batteries up to a 225 Ah rating. Typical charging times are shown on the linked image.
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  • Should CTEK MULTI US 7002 Battery Charger Be Connected Directly to Vehicle Battery while Charging
    When charging your vehicle's battery with a charger like the CTEK MULTI US 7002 12-Volt Universal Battery Charger # CTEK56353 you will want to connect the charger directly to the battery. A great option if the battery is difficult to access is to use the included eyelet-terminal attachment system with the Comfort Connect end plug to connect the battery to the CTEK charger. I found the owner's manual for the 1996 BMW 328i to state that if the vehicle is to be parked for longer than 4 weeks,...
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  • Long Term Battery Charger and Maintenance for a 2015 Mitsubishi Lancer Evolution X
    You can keep certain battery chargers connected to a vehicle battery all the time such as CTEK charger # CTEK56353 which would be ideal for your 2015 Mitsubishi Lance Evolution. This charger is not a trickle charger (trickle chargers can overcharge a battery). This CTEK charger will maintain and recondition the battery and only charge it up again if it needs it. All while staying connected to the vehicle battery. For what you want to do this is the perfect charger. I have linked a video...
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  • Powering a Truck Mounted Winch and Charging a Trailer Mounted Battery
    Unless the truck has a very heavy duty alternator that can push back enough amperage along the larger gauge wire then the best that it will do is provide a maintenance charge to the trailer mounted battery but it will not charge it up. The winch will still dissipate the charge faster than the maintenance charge. If you have power coming from multiple sources and ending at the same point such as a battery or winch then I would also install diodes rated high enough for the power draw to...
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  • Why Doesn't CTEK Charger Go In to Bulk Charge Mode on Brand New Battery
    If the battery is brand new and has a full charge on it already then the CTEK Charger part # CTEK56353 will detect that and bypass the bulk charge phase and go straight to maintenance mode.
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  • Will Towing Vehicle Provide Charge To Trailer Battery Through Trailer Connector
    The battery on the trailer will not charge if it is attached to the 12V power wire from the towing vehicle. It will provide a small amount of current that helps maintain the current charge of the trailer battery. I recommend using a battery charger like the CTEK MULTI US 7002 12-Volt Universal Battery Charger, part # CTEK56353. This charger features pulse maintenance and will not overcharge the battery like many of the common chargers do.
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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 7002 # CTEK56353 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 7002 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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  • Mode to Use to Maintain Deep Cycle Battery with CTEK 7002 Battery Charger
    If you are using CTEK battery charger # CTEK56353 I would choose Normal or Supply mode to continually maintain the backup deep cycle sump pump battery. I have included a link to our help article on CTEK battery chargers for you.
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  • Battery Charger Recommendation for 2 6-Volt Batteries Wired In Series
    I spoke with my contact at CTEK about the MULTI US 4.3 Battery Charger # CTEK56353 charging and maintaining two 6 volt batteries in series. She said that since the # CTEK56353 charger is designed to charged 12 volts, you will have no problems charging two 6 volt batters in series.
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  • Recommended Battery Maintainer For Trailer Battery
    The CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance # CTEK56353, is designed for long term use as well as short term. This is a battery maintainer that works slightly differently from a charger. It does not turn off, but rather will allow the battery to drain slightly and charge back to simulate normal use and keep the battery working properly. I have one on my motorcycle and it definitely has increased the life of the battery when stored for the colder months....
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  • Battery Charger Recommendation for an Optima Blue Top Deep Cycle Starting Battery
    The recommended battery charger for the Optima Blue Top marine deep cycle and starting battery is the CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance and Backup Power, item # CTEK56353. The CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse Maintenance, item # CTEK56158, is recommended for Red Top Optima Batteries and will work on the Blue Top models but will take much longer to bring the deep cycle battery to a full charge.
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  • Does the Battery Charger in My Truck Camper Shut Down When Fully Charged and What to Do if Not
    I will be glad to try to help. I am guessing here, but I believe what you are saying is that your truck camper has a battery charger that functions when you are connected to shore, household, power. If this is the case, you should contact the camper manufacturer to find out if the charger has a system for checking the battery charge level and shutting down when the battery is fully charged. I imagine the charger in the trailer is set up this way. If the manufacturer cannot provide this...
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  • Charging Six 6-Volt Batteries in a 12 Volt System with 1 Battery Charger
    You can choose multiple batteries provided they are connected in parallel to remain a 12 volt system. You will connect the positive terminal at the first battery positive post and the negative terminal to the first battery negative post. If you have 2 banks of 3 batteries, you would have to separate the 2 banks of batteries and charge each set of 3 separately. You will want to use a larger charger that can handle a higher ah rating. The CTEK MULTI US 7002 12-Volt Universal Battery Charger,...
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  • How to Manually Put the CTEK US 7002 into Maintenance Mode
    If when you are charging a battery with the CTEK Charger part # CTEK56353 it hasn't gone into maintenance mode after three days the battery is most likely worn out and needs to be replaced. The SUPPLY mode that you can select for the charger is the same thing as maintenance mode though. So after three days if you needed to switch it to maintenance mode you would need to press the selector button until it selects supply mode.
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  • CTEK Battery Charger has Been in the Desulfation Stage for 2 Days
    If the battery was completely dead to start with (a "bad" battery) then not even a CTEK charger can resurrect it. If the battery was not dead or considered a dead battery then either it really needs that much desulfation or it could be that the ground connection is not good. This happens with my CTEK charger sometimes if I do not have it grounded to a good, solid bare metal surface. You may need to try taking some sand paper to where you have the charger grounded to get the most suitable...
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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 # CTEK56353. 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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  • How to Wire Two 6-Volt Batteries In Series to Double Output Voltage
    To wire two 6-volt batteries in series to produce 12-volts, you would connect the load to the positive terminal of battery # 1. Connect the negative terminal of battery # 1 to the positive terminal of battery # 2. Ground the negative terminal of battery # 2. I have produced a diagram showing the connections for you.
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    Image 1 for
  • Can a CTEK Battery Charger Charge a Motorcycle and Car Battery at the Same Time
    Car batteries and motorcycle batteries have much different amp hour ratings and should be charged separately. I recommend the CTEK charger # CTEK56353. I own this battery charger as do several of my co-workers and it works fantastic for everything from 12 volt lawn mower batteries, motorcycle batteries, to car and truck batteries. I have included a link to a video review of this charger and a link to our FAQ article on battery chargers for you. If 2 batteries had the same rating then...
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  • Wiring Electric Winch and Options to Charge a Trailer Mounted Battery without a Tow Vehicle Present
    If you cannot have the trailer connector to the truck then there wouldn't be a way to charge a trailer battery or power the winch off of the tow vehicle. I have included a link on different ways to power an electric winch that might be helpful to you. Using an AC powered battery charger such as # CTEK56353 would be a great option to make sure the battery is fully charged prior to heading out and doing some winching where there is no AC outlet. I have also linked a help article on battery...
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  • What Wire Gauge Should be Used to Wire Two 6-Volt Batteries in Series
    Yes, it is advisable to use the same wire gauge for all connections when wiring two batteries in series to provide increased voltage. This same idea also applies to a lesser degree when wiring multiple batteries in parallel to increase amp-hour capacity (with the same voltage).
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    Image 1 for
  • Indicator Lights on CTEK Multi US 12-Volt Battery Charger # CTEK56353 Do Not Change
    I own and use this same # CTEK56353 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 varies...
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  • Can the Recondition Mode of a CTEK Battery Charger Used Indefinitely
    When you select the recondition setting for the CTEK MULTI US 3300 12-Volt Universal Battery Charger # CTEK56353 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...
  • Charging Two Paralleled 12V Batteries with CTEK MULTI 3300 12-Volt Battery Charger # CTEK56158
    I have used a CTEK battery charger on my motorcycle and lawn mower batteries for over a year and I can tell you that I am very pleased with its performance and versatility. To charge your two parallel-wired 12V batteries you will want to disconnect them from each other and charge each one individually if they are badly depleted. You only need to remove one lead from either battery to separate them. You will connect the charger clips to one battery and then the other. If the batteries...
    view full answer...
  • Can the CETEK Battery Charger CTEK56353 Be Used While RV Battery is Connected
    The CTEK Multi US 3300 can indeed be used while your RV battery is connected. Since the converter will not come into play unless the RV is plugged into shore power, the converter will not be damaged. To see the owners manual and instructions, click the provided link. I've also linked to a product description video that you might find helpful.
    view full answer...

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