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CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance

CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance

Item # CTEK56191
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CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance 32 Ah CTEK56191
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This powerful four-step charger uses a patented, pulse-maintenance system to charge 6V batteries as often found on older vehicles. Patented technology keeps your battery ready to go when you are. Call 800-298-8924 to order CTEK Power Inc battery charger part number CTEK56191 or order online at etrailer.com. Free expert support on all CTEK Power Inc products. Guaranteed Lowest Price and Fastest Shipping for CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance. Battery Charger reviews from real customers.
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  • Reviews (2)
  • Q & A (26)
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CTEK Power Inc Battery Charger - CTEK56191

  • ATV
  • Lawn Mower
  • Motorcycle
  • Snowmobile
  • Trailer
  • Battery Charger
  • CTEK Power Inc
  • 6V
  • Wall Outlet to Vehicle Battery
  • Charges/Maintains
  • 32 Ah

This powerful four-step charger uses a patented, pulse-maintenance system to charge 6V batteries as often found on older vehicles. Patented technology keeps your battery ready to go when you are.


  • Reliable, maintenance-free, 4-step system constantly monitors and maintains 6V 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
  • Convenient accessories (sold separately) provide additional security and convenience
    • Reduce the hassle of charging multiple vehicles w/ additional battery-hookup cables


  • Application: most starter and deep-cycle, 6V, lead-acid batteries - including wet, MF, AGM and most gel batteries
    • Charges batteries w/ capacities from 1.2 Ah - 32 Ah
    • Maintains batteries w/ capacities up to 100 Ah
  • Charge cycle: 4-step, fully automatic charger w/ pulse maintenance
  • Dimensions: 5.5" long x 2" wide x 1.5" tall
  • Includes:
    • 6V 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 UC 800 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 UC 800 charger 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.

Close-up of CTEK's Comfort Connect plugs

CTEK UC 800 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 UC 800 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.

Additional Specs:

  • Model: 56-191 (UC 800)
  • 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
  • Output voltage: nominal 6V
  • Charging current: 0.8A rms (at full charging current)
  • Back current drain: less than 1 mAh per month
  • Charging voltage: 7.2V
    • Nominal charging voltage: 6V
  • Ripple wave: less than 2 percent variance (max 50 mV rms, max 0.05A)
  • 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

56-191 CTEK UC 800 6V 4-Step, Pulse-Maintenance, Lead-Acid Battery Charger for Motorcycles

Installation Details CTEK56191 Installation instructions

Customer Reviews

CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance - CTEK56191

Average Customer Rating:  5.0 out of 5 stars   (2 Customer Reviews)

This powerful four-step charger uses a patented, pulse-maintenance system to charge 6V batteries as often found on older vehicles. Patented technology keeps your battery ready to go when you are.

- CTEK56191

The product arrived in great condition. Works as advertised 584055

- CTEK56191

Arrived as promised and quality was exc ellent 130848


Ask the Experts about this CTEK Power Inc Battery Charger

  • When Replacing 12-Volt Batteries With 6-Volt Are They Run In Parallel Or Series
    Your system could be 12 volts with the batteries wired in parallel or it could be 24 volts which requires wiring in series. If you have a 24-volt system you will need a quantity of (4) 6-volt batteries. If you have a 12 volt system and you are using 6-volt batteries you will need to run the batteries in series. You will need to run a wire from the positive post on one battery to the solar panel. Then run a jumper form the negative post of that battery to the positive post of the second...
    view full answer...
  • Is Wiring Two 6 Volt Batteries in Series Safe
    You can safely wire a pair of 6 volt batteries together in series. Just be sure you make sure you ground the batteries and also it would be a very good idea to use new batteries and there is no reason to realistically expect any type of danger as wiring batteries in series is a very common practice.
    view full answer...
  • Charging Six 6V Batteries Wired in Series
    Hooking up a charger like the CTEK # CTEK56191 to six 6V batteries wired in series won't work well to ensure that every battery gets fully charged. This is because when hooking up the charger you're going to connect to the positive terminal on the lead battery and to the negative terminal on the last battery. Once the charger reads that last battery as being charged it will switch to its pulse-maintenance mode but there's a good chance that the other batteries in the line aren't yet charged...
    view full answer...
  • Battery Charger for 6 Volt Deep-Cycle Batteries
    If you have two separate 6 bolt batteries and they are not wired in series then the best option is to use two of the CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance # CTEK56191, one for each battery. This will fully charge and maintain the batteries for both. If you only want to use a single charger, that is certainly an option so long as you don't mind wiring your two 6 volt batteries in series, like in the accompanying diagram. That diagram shows a pair of 12 volt batteries...
    view full answer...
  • Recommended Battery Charger For 6V Batteries
    Most of the battery chargers we offer are for 12V batteries and have a range from 4 to 8 step charging process. From my research I see the Trojan T-105 battery is a 6V battery. We offer one charger for 6V batteries. The 6V battery charger we offer is the CTEK UC 800 6-Volt Battery Charger, part # CTEK56191. This is a 4-step charger that automatically switches to pulse-maintenance phase when full charge has been reached.
    view full answer...
  • Recommended Battery Charger to Charge Two 6-Volt Batteries in Series for 12-Volts
    The CTEK UC 800 6-Volt Battery Charger # CTEK56191 that you referenced is a great option. This will charge and maintain your batteries. It's designed to avoid over or under charging and will switch to pulse-maintenence phase automatically when your batteries are fully charged.
    view full answer...
  • Wiring Two 6 Volt Batteries in Series to get 12 Volts
    When you connected the positive side of one 6 volt battery to the negative side of the other 6 volt battery, did you ground the negative side of the battery, as shown in the accompanying diagram? If not, that's likely what you are doing wrong, apart from the more obvious culprit of having bad batteries.
    view full answer...
  • Charger Recommendation for Charging 2 6 Volt Batteries in Parallel on Trailer
    6 volt batteries ran in parallel will have an output of 6 volts so you'd just need a 6 volt battery charger like CTEK # CTEK56191 connected to the battery in parallel and you'd be set.
    view full answer...
  • CTEK Battery Charger # CTEK56353 Recommendation for Charging a 6 Volt Battery
    In order to charge a 6-volt power system you will want to use a CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance, part # CTEK56191. I attached links below to a review video of this product and installation instructions for you to check out also. The reason you should not use a CTEK 7002 is because it designed for use on 12 volt battery systems, and would not be compatible with your 6 volt system.
    view full answer...
  • Solution to Charge 6 Volt Battery Bank Wired in Parallel
    6 Volt batteries wired in parallel have an output voltage of 6 volts so I would not recommend connecting a 12 volt battery setup to them since the voltage would be way to high. You'd need a 6 volt charger like # CTEK56191 and you'd be set.
    view full answer...
  • Can 2-6 Volt Battery Chargers Be Wired Together in Series to Charge a 12 Volt Battery Charger
    I spoke with my CTEK representative, who said that you can indeed rig up the 2-6v charges in series, but your output will only be 1 amp. If your battery is under 15aH, it'll work pretty well for you. If the battery capacity is greater than that, you'll want to return your chargers for a 12-volt model. We offer the CTEK # CTEK56353 that works great on most starter and deep-cycle, 12V, lead-acid batteries - including wet, MF, AGM and most gel batteries. I've linked you a product video...
    view full answer...
  • Recommended Wire Gauge When Connecting Two 6V Batteries
    When connecting two 6V batteries in series I recommend using 10 gauge wiring like # 10-1-1 (sold by the foot). You could probably get away with 12 gauge wire but to be safe and allow for less resistance 10 gauge wiring is your best bet.
    view full answer...
  • Does CTEK UC 800 6-Volt Battery Charger CTEK56191 Shut Off When Battery is Charged
    Yes, the CTEK UC 800 6-Volt Battery Charger # CTEK56191 that you referenced will automatically shut off after the battery is fully charged. Basically once it's fully charged it switches to a maintenance mode that keeps the battery topped off.
    view full answer...
  • How Long Should it Take for a CTEK Battery Charger to Charge a 6 Volt Battery
    It should only take 1 night at most for CTEK battery charger # CTEK56191 to charge the 6 volt battery. It is capable of charging batteries with 1.2 to 32 amp hour ratings. It will only maintain the charge if the battery is rated for 33 to 100 amp hours. Sometimes the ground connection can cause the charger to not charge properly which has happened to me. Make sure the ground location is clean and free of dirt and corrosion or try moving to a different ground location. If that doesn't...
    view full answer...
  • Troubleshooting Arc Flash When Wiring Two 6V Batteries in Series
    The arc you experienced when wiring up your two 6V batteries in series could have been caused by a couple of things. I first recommend making sure all of your connections are secure, specifically those being made to the positive terminals. If any of those are loose then it could cause electricity to essentially jump across the attachment leading to that arc flash. Another thing I recommend doing when hooking everything up is waiting to attach the ground connection last. This will...
    view full answer...
  • Charger Recommendation for 6 Volt Trailer Battery
    You would need to use a 6 volt charger like part # CTEK56191 as a 12 volt charger would not work on a 6 volt battery.
    view full answer...
  • Can 12-Volt Battery Charger Charge Two 6-Volt Batteries Wired in Series
    Being able to charge batteries wired in series isn't CTEK's strong suit. The # CTEK56353 charger will read the output as 12 volts, and could consider the batteries fully charged but it's possible they wouldn't be balanced. In this instance, CTEK recommends using a charger for 6V batteries, like part # CTEK56191 to charge the batteries individually. The batteries should be disconnected from each other for charging. The NOCO chargers however, like # 329-GENIUS10 is capable of charging...
    view full answer...
  • Charging System for 6 Volt Battery and 12V Battery
    The CTEK MULTI US 3300 12-Volt Universal Battery Charger w/ Pulse Maintenance # CTEK56353 is only a 12V charger that will allow you to connect the lead wires to the battery terminals with either spring clamps or ring terminals. If you need a 6V charger, you would instead use the CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance # CTEK56191. If you are wanting to charge between the two batteries, that is not a directly compatible option. You could however charge two 6V batteries...
    view full answer...
  • CTEK Battery Charger that Can Charge 6 Volt Battery Bank
    If the batteries are wired in series so that that output voltage is 12 volts then yes the CTEK part # CTEK56353 will work. If for some reason the output voltage was 6 volts then you'd need a 6 volt charger part # CTEK56191 instead.
    view full answer...
  • What Charger to Use for 6-Volt Golf Cart Batteries
    It is possible to use a 12-volt battery charger like the NOCO Genius Battery Charger and Maintainer # 329-GENIUS5 that you referenced with 6-volt batteries only under specific conditions. Two batteries at a time can be given a maintenance charge from a 12-volt charger provided they are wired in series to present a 12-volt load to the charger. They also have to be in good condition and fully charged to do this. You cannot charge depleted 6-volt batteries with a 12-volt charger. My...
    view full answer...
  • Battery Charger Recommendation for Charging 2 6-Volt Batteries
    You need to find out if the 2 6-volt batteries at a time are wired in series or in parallel. If they are wired in parallel then the batteries will have an output voltage of 6-volts and would need a CTEK UC 800 6-Volt Battery Charger # CTEK56191. If they are wired in series the output voltage of the 2 batteries will be 12-volts. The CTEK Multi US 7002 12-volt Universal Charger # CTEK56353 that you referenced would be an excellent choice if this is the case. I attached a review video...
    view full answer...
  • Can CTEK Battery Charger Charge 6 Volt Batteries Wired in Series
    If the batteries are wired in series so that that output voltage is 12 volts then yes the CTEK part # CTEK56353 will work. If for some reason the output voltage was 6 volts then you'd need a 6 volt charger part # CTEK56191 instead. I attached a diagram that shows the difference between wiring batteries in series and in parallel too.
    view full answer...
  • Can Two 6 Volt batteries Connected in Series be Charged at the Same Time
    Honestly the best solution is to charge each battery individually with a 6 volt charger such as # CTEK56191 or a charger than can charge multiple batteries individually at the same time such as # 329-G4. The reason you'd want to charge the batteries individually is because if you charged then while connected in series it would take a lot longer to charge up both of the batteries. With the NOCO charger # 329-G4 you could still charge the batteries while in series since it does both 6...
    view full answer...
  • Charging Two 6 Volt Batteries in a Series to Create a 12 Volt
    Charging two 6 volt batteries by your alternator through your starter via a Blue Seas switch isn't going to work because 6 volt systems are not as common anymore. Blue Seas currently only offers 12 and 24 Volt switches. Actually, your best option and what I recommend is the CTEK UC 800 6-Volt charger # CTEK56191. It's a pulse maintenance system to charge 6 Volt batteries. If you wire the batteries in series that produces an output of 12 volts, then the CTEK 7002 12-volt battery charger...
    view full answer...
  • How to Charge Multiple Batteries of Different Voltages
    When charging batteries in a multi-battery setup it is always best to charge each one individually. In the case of two 6-volts wired together in series you would need to keep these connected together and charged as one unless your charger is rated for use with 6V batteries, like our CTEK charger # CTEK56191. Multiple series-wired batteries can be charged all together but this will take a very long time and the battery with the highest Ah capacity will tend to demand most of the available...
    view full answer...
  • 6 Volt Battery Charger
    That's a great question. You can use a 1 amp charger to charge a 6 volt battery, however the charger # CTEK56158 is for 12 Volt batteries. While it is still possible to charge two 6 volt batteries with a 12 volt charger, I recommend CTEK UC 800 6-Volt Battery Charger w/ Pulse Maintenance part # CTEK56191 for your 6 volt batteries. It's much more convenient, and safe, there's no worrying if you have the batteries hooked up properly, or if they are wired in series or parallel. The 6 volt...
    view full answer...

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Info for this part was:

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