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CTEK® US 800 12V Battery Charger

The Quadratec® Difference
Catalog #: 97004.1001
CTEK® Part #: 56-865
Your ideal maintenance battery charger for 12-volt batteries.

The US 800 is a great 12-volt battery charger in small format and extremely good as a maintenance battery charger for seasonal or hobby vehicles with batteries up to 100Ah. It easily charges batteries common to motorbikes, jet skis, snowmobiles or lawnmowers.
  • Flexible care for battery needs
All CTEK chargers are developed to take special care of the batteries in the vehicle and at the same time focus on the safety of the person and the vehicle. Depending on the weather conditions, usage and the type of battery dictate the care that the battery needs. CTEK chargers are developed to handle virtually all lead-acid batteries, weather conditions and vehicle types. The importance of battery charging is clear when the statistics show that 70% of all battery returns are due to poorly charged batteries. Save time, money and work by charging batteries with a CTEK charger.
  • Fully-automatic – for
charging and maintenance There is no need for any specific knowledge of batteries or their charging methods; the US 800 will take care of it. The charger takes its own readings and then begins to charge the battery. Once it is finished charging, it will automatically switch to its maintenance phase–CTEK’s patented pulse charging– arguably the most caring mode for a battery connected for a long time. The US 800 can be connected for months and it is specifically developed for seasonal vehicles.
  • Patented desulfation
function Unused batteries lose their power and their life is shortened through sulfation. It is also more difficult to charge sulfated batteries. The US 800 has a patented method for reconditioning sulfated batteries. The charger analyzes the state of the battery and, if possible, recovers the battery and its power.
  • Compatible with other
electronic equipment Most vehicles today are equipped with sensitive electronic systems. Unlike less-sophisticated chargers, there is no need to disconnect the battery; the US 800 is specially designed to not damage electronic systems.
  • Made for all weather
conditions and situations The US 800 is prepared to charge and maintain, no matter the weather, temperature or situation. The US 800 is a very light and compact charger, but it is extremely robust and water and dust resistant (IP65 classification). The US 800 is certified for use between –4ºF and +122ºF. In order to make things easier and more convenient, the Comfort Connect (eyelet terminals) can be permanently connected to the vehicle’s battery.
  • Designed for safety
All CTEK models are designed to consider the safety of the user. They are spark free, making the connection much easier and safer considering the gases batteries normally produce. The US 800 is also protected from reverse-polarity connections and is short-circuit proof. A red light on the charger will simply indicate that the charging cannot begin until the user has connected the charger correctly.

Technical data – US 800
Input voltage AC: 100–120VAC, 50–60Hz, output power is reduced at lower input voltage
Output voltage: 12V
Efficiency: HIGH 85%
Charging voltage: 14.4V
Charging current: 0.8A max
Back current drain*: <1mAh
Ripple**: -2%
Ambient temperature: -4°F to +122°F, output power is reduced automatically at higher temperatures
Type of charger: 4 step, fully automatic switch mode with pulse maintenance
Type of batteries: 12V lead-acid batteries (Wet, MF, AGM and most GEL)
Battery capacity: 1.2–32Ah (charging) 1.2–100Ah (maintenance)
Dimensions (L x W x H): 5½x2x1½ inches
Insulation class: IP65 (splash and dust proof)
Weight: 0.7lbs

*) Back current drain is what drains the battery if the charger is connected without the power cord connected.
**) Ripple describes the quality of the current and voltage. A high current ripple heats the battery and shortens its life. A linear charger has a current ripple of 70–400% which is much larger than the maximum 5% for a modern sealed battery. High voltage ripple could harm other equipment that is connected to the battery. US 800 delivers voltage and current with very low ripple. The battery has a long service life and there is no risk of damage to other electronic devices connected to the battery.
Installation Notes
Installation Difficulty:
Level 1Beginner
Parts Included
Charger Comfort Connect w/ Eyelets Comfort Connect w/ Clamps
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