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CTEK 12v Multi US 3300 3.3 Amp Smart Charger - CTEK-56-158

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Product InformationStore Part Number: CTEK-56-158


The CTEK MULTI US 3300 (Part No. 56-158) is a versatile battery charger in a compact format that makes it convenient and easy to charge and maintain all household vehicles. The special cold mode means that you can also charge during cold winter days without problems.

Perfect for car, vintage car, personal watercraft, boats with one battery, boats with start & service battery, scooter, motorcycle, Quad/ATV, lawnmower, caravan, and tractor.

CTEK offers a wide range of NEW GENERATION battery chargers. Unlike old battery chargers, CTEK chargers are designed with a focus on simplicity, safety, and flexibility. The MULTI US 3300 is the charger that every household needs. It is perfectly suited for motorcycles, cars, lawn mowers, jet skis, and any other vehicle with batteries up to 120 Ah. Simply connect it and battery problems are in the past.

There is no need for any specific knowledge of batteries or their charging methods; the MULTI US 3300 will take care it. Once switched to the preferred mode, 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. Simply connect it to solve most battery problems from the past.

The MULTI US 3300 is specifically developed for different needs, vehicles, and batteries. There is a choice between three different modes. The low current mode (the motorcycle icon) is perfect for smaller 12V batteries such as motorbikes, lawn mowers, jet skies, snowmobiles, etc. The higher current mode (the car icon) is for automotive or marine applications with larger batteries. Finally, an additional winter mode (the snowflake) is specifically aimed at charging and maintenance in cold weather. It is also perfectly suited for Optima Red Top batteries.

Unused batteries lose their power and their life is shortened through sulphation. It is also more difficult to charge sulfated batteries. The MULTI US 3300 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.

Most vehicles today are equipped with sensitive electronic systems. Unlike less-sophisticated chargers, there is no need to disconnect the battery; the MULTI US 3300 is specially designed to not damage electronic systems.

The MULTI US 3300 is prepared to charge and maintain, no matter the weather, temperature, or situation. The MULTI US 3300 is extremely robust and water and dust resistant (IP65 classification). The MULTI US 3300 is certified for use between -4° F and +122° F. In order to make things easier and more convenient, the Comfort Connect (eyelet terminals) can be permanently connected to the vehicle's battery.

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 MULTI US 3300 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.

Includes two interchangeable connection leads, one with clamps, and one with eyelet terminals.


  • Fully automatic 4-step charging and maintenance maximizes battery life and performance
  • Numerous accessories simplify using the same charger for multiple batteries
  • Water-resistant so that the solution could be taken to the problem even if it rains or snows
  • Patented maintenance charge for a unique combination of maximized life and performance
  • Patented desulphation that extends the battery life
  • No sparks, short-circuit proof, and reverse-polarity protected for untroubled usage
  • 5 Year Warranty

Tech Specs

  • Dimensions (LxWxH): 6.5 x 2.0 x 1.5 in
  • Weight: 1.1 lb
  • Shipping Weight: 3 lb
  • Charging Voltage: 14.4 V / 14.7 V
  • Maximum Charging Current: Max 3.3 A
  • AC Input: 120 VAC
  • AC Frequency: 60 Hz
  • Model: CTEK 56-158
  • Manufacturer: CTEK
  • Charger Type: 4-Step Fully automatic charging cycle
  • Battery Type: 12 V lead-acid batteries (WET, MF, Ca/ca, AGM and GEL)
  • Battery Capacity: 1.2-90 AH, maintenance charging up to 120 AH
  • Ambient temperature: -4° F to +122° F (-20° to +50° C), output power is reduced automatically at high temperatures
  • Insulation: IP65(splash and dust proof)
  • Warranty: 5 Years
  • Manufacturer Part #: CTEK 56-158
  • Made In: Asia

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Reviews and Ratings

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Rated 5.00/5 Stars from 1 customer reviews.

Do you own the CTEK-56-158? Please, tell us what you think about it. It helps us provide you with better products. Please note that it may take up to 72 hours for your review to appear.

CTEK 3300 does it all
Pros: Works exactly as described, meeting all claims and expectations. Its operating temperature range allows you to use it when you need it most--cold, sub-freezing weather. It is moisture/water resistant meaning it will work in the rain. (I happen to keep it off the ground if I expect rain or snow.) So far, it has been perfect for keeping the trunk battery in my 2004 Mercedes fresh. When the electric consumers (i.e., trunk) battery gets low, all sorts of problems emerge. Charging through the trunk battery allegedly charges the starter battery, as well. When charged, the CTEK 3300 goes into maintenance mode and pulse charges the battery.
Cons: A rubber bumper protector is optional at an extra cost. Worth it and should have come with the charger. Hard to find at discounted prices. (No show-stoppers.)
If you have a car with a second battery, this is a must if the car is driven infrequently.
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Written by JettaRed on Jan 06, 2017. Ownership: Use regularly. Knowledge Level: Genius is my way of life — (13 of 14 customers found this review helpful

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User Manual

Order Line: 1-800-362-5397
M–F 6am–5pm PST
Tech Help: 541-474-4421
Fax: 541-471-6014
276 Tech Way, Suite A
Grants Pass, OR 97526
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