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CTEK US 0.8 Universal Battery Charger with Pulse Maintenance - Small 12-Volt Batteries

CTEK US 0.8 Universal Battery Charger with Pulse Maintenance - Small 12-Volt Batteries

Our Price: $76.06
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Battery Charger
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This powerful, all-weather, 6-step charger uses a patented pulse-maintenance system to charge and maintain 12V batteries. Designed to charge small batteries like those for motorcycles, snowmobiles, yard maintenance machines and trailer breakaway kits. 1-800-940-8924 to order CTEK Power Inc battery charger part number CTEK56865 or order online at Free expert support on all CTEK Power Inc products. Great prices and Fastest Shipping for CTEK US 0.8 Universal Battery Charger with Pulse Maintenance - Small 12-Volt Batteries. Battery Charger reviews from real customers.
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  • Reviews (11)
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CTEK Power Inc Battery Charger

  • Lawn Mower
  • Motorcycle
  • Snowmobile
  • Trailer
  • 12V
  • Battery Charger
  • CTEK Power Inc
  • Wall Outlet to Vehicle Battery
  • Charges/Maintains
  • Trickle Charge
  • 32 Ah

This powerful, all-weather, 6-step charger uses a patented pulse-maintenance system to charge and maintain 12V batteries. Designed to charge small batteries like those for motorcycles, snowmobiles, yard maintenance machines and trailer breakaway kits.


  • 6-Step fully automatic 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
  • 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, versatile 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 12V battery charger, 1 set of 16" battery cables with battery-terminal clips, 1 set of 16" battery 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 32 Ah
    • Maintains batteries with capacities up to 100 Ah
  • Charge cycle: 6-step, fully automatic charger with pulse maintenance
  • Input voltage: 110V AC - 120V AC
  • Charging voltage: 14.4V
  • Charging current: 0.8A
  • Dimensions: 5-1/2" long x 2" wide x 1-1/2" tall
  • 5-Year warranty

CTEK MULTI US 0.8 bulk charging time chart

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

CTEK MULTI US 0.8 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 0.8 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, 6-step process uses switch-mode, pulse-maintenance technology.

CTEK MULTI US 0.8 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. 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. 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.
  5. Float-maintenance stage maintains a constant voltage of 13.6V during the first 10 days.
  6. Pulse-maintenance stage begins 10 days after the battery is fully charged. 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. 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, ensuring a consistent charge. 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 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.

Keeps You Informed

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

CTEK US 0.8 indicator illustration

Additional Specs

  • Current: 0.3A 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

56-865 CTEK MULTI US 0.8 12V 6-Step, Pulse-Maintenance, Lead-Acid Battery Charger

Item # CTEK56865

Installation Details CTEK56865 Installation instructions

Customer Reviews

CTEK US 0.8 Universal Battery Charger with Pulse Maintenance - Small 12-Volt Batteries - CTEK56865

Average Customer Rating:  4.8 out of 5 stars   (11 Customer Reviews)

This powerful, all-weather, 6-step charger uses a patented pulse-maintenance system to charge and maintain 12V batteries. Designed to charge small batteries like those for motorcycles, snowmobiles, yard maintenance machines and trailer breakaway kits.


I've been using a couple CTEK 3300 units for years on my cars, so I bought this for our riding mower. The CTEK chargers have been absolutely reliable over the years. Shipping and service from eTrailer was excellent as well.



CTEK still working fine keeping the battery charged on our riding mower and not a single problem.


Sorry, but I have never used it.

Etrailer Expert

Katrina B.


Whenever you get the opportunity to use this item, we would appreciate your updated feedback of the item.


I've had this charger for a year and it works great. I was able to attach one cable end permanently to a jetski battery and use the clips on the other cable end on my fishing boat electronics battery. The quick release built into the cable makes it easy to switch froom 1 craft to the other. Charges at a reasonable speed and shifts into battery maintenance automatically. Don't have to worry about quality when I buy from you guys.


Operates just as described with most any of the smaller batteries. I also think it would help keep a small car battery fresh while it is in storage but it would need a full charge first. Great product!!!


Delivered in four days to Baltimore Maryland. J Leno recommend. This is my second one for second car. Keeps batteries top up, cars may sit for six weeks or more at a time between use.



Used on 2002 2500 Avalanche, and 2017 Santa Fe Sport. Keep batteries at full charge.


Easy to use website, competitively priced, good updates on order status, well packed and shipped very quickly.


Great charger it is working right now on my lawn tractor battery. Just what I needed to keep my equiptment up and running. I also intend to use on my portable electric generator.


Arrived promptly. No issues!



Still working great. Ready to purchase a second unit!


Great charger!


Product and service is excellent!



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

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    I took a look at the online owner's manual for your 2017 GMC Sierra Denali 3500. I was able to find that there is a "trailer battery" fuse located in the number 2 position in the fuse block in the engine compartment, which is on the driver's side of the truck. I recommend verifying this information and taking a look at the fuse panel map in your copy of the owner's manual as well.
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