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CTEK Multi US 25000

CTEK Multi US 25000

The Smarter Charger with Maximum Power to Rapidly Charge

CTEK MULTI US 25000 (Part No. 56-674) is an 8-step, fully automatic primary switch mode battery charger. A powerful charger for 12V batteries that require rapid charging such as in garages, RV’s, boats, and, of course, cars. Unlike old traditional battery chargers, CTEK chargers are designed with a focus on simplicity, safety, and flexibility.

Fully automatic- for charging and maintenance
In addition to the normal charging of batteries, they also have a fully automatic charging cycle through CTEK's in-house patented system for maintenance charging. The batteries are kept at full capacity (float) over the first 10 days period. The chargers then switch to pulse maintenance, which is the optimal way of storing the batteries in the long-term and providing them with maximum service life.

Patented desulfation function
Unused batteries lose their power and their life is shortened through sulphation. It is also more difficult to charge sulfated batteries. CTEK MULTI US 25000 has a patented method for reconditioning sulfated batteries. The charger analyzes the state of the battery and then, if possible, recovers the battery and its power.

Weather independent
The chargers are fitted with temperature sensors adapting the charging voltage to suit the battery temperature and handle effective charging no matter the climate, from 0F to 1200F. They are very robust and have an IP44 classification, splash and dust proof.

Electronic protection
Most vehicles today are equipped with sensitive electronic systems. Unlike less-sophisticated chargers, there is no need to disconnect the battery as CTEK MULTI US 25000 is specially designed to not damage the electronic systems.

Unique SUPPLY and RECOND mode
The SUPPLY mode serves as a power supply unit which can run 12V equipment up to 25A. While changing a battery, the SUPPLY mode will make sure important settings won't be lost. The unique RECOND mode restores the power capacity in a stratified battery and therefore prolongs the battery's life.

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 due to the gases batteries normally produce. CTEK MULTI US 25000 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
Part No. 56-674

  • Input voltage: AC 100-120VAC, 50-60Hz
  • Output voltage: Nominal: 12V
  • Efficiency: HIGH 85%
  • Charging voltage: 14.4V, temperature compensated
  • Charging current: 25A max
  • Back current drain*: <2Ah per month
  • Ripple**: 4%
  • Ambient temperature: 0°F to 120°F, the output power is reduced automatically at higher temperatures
  • Cooling Fan
  • Type of charger: 8-step, fully automatic switch mode with pulse maintenance
  • Type of batteries: 12V lead-acid batteries (Wet, MF, AGM, GEL and Ca)
  • Battery capacity: 50-500Ah
  • Dimensions (LxWxH): 9½ x 5½ x 2½ inches
  • Insulation: IP44
  • Weight: 3.2lbs

*) 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. MULTI US 25000 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.


“Having owned several of another ‘popular’ brand of charger, the CTEK is far and above superior in every possible category. WELL worth the miniscule additional cost. ”