CTEK Multi US 3300 12-Volt Smart Battery Charger

by Kinetik

• Includes two interchangeable connection leads, one with clamps, and one with eyelet terminals
• Four step, automatic switch charging and three separate charge modes that together allow for easy, convenient, no-watch battery charging
• Charges 12-volt lead-acid batteries (Wet, MF, Gel, AGM and Ca) from 12Ah to 75Ah (charging) or 12-120Ah (maintenance)
• Maintenance pulse charging increases battery life and gives superb performance, and patented desulphation functionality allows for the recovery of slightly sulphated batteries
• Compact design with mounting holes allows for permanent assembly, making this charger ideal for motorcycles, cars, lawn mowers, jet skis and other vehicle with batteries up to 120Ah

Product Description

CTEK Power's Multi US 3300 is a primary switch mode battery charger, with pulse maintenance and is a part of a series of professional battery chargers from CTEK Sweden AB. These chargers represent the latest technology within battery charging. A recent addition to the CTEK family of "the smartest battery chargers in the world," the Multi US 3300 contains three charging modes, and automatically and easily charges all 12V lead-acid batteries, making it perfect for motorcycles, cars, lawn mowers, jet skis and any other vehicle with batteries up to 120Ah.

Most Helpful Customer Reviews

76 of 76 people found the following review helpful

5.0 out of 5 stars Hands down the best battery tender / trickle charger made January 17, 2008

By Richard J. Misner

I own two of these excellent chargers - they are very simple to operate and very durable.

The chargers are weatherproof, and you can permanently mount them in the engine compartment with the provided ring terminals, or just use the alligator clips.

The charger has a battery status indicator (low / full), and settings for Motorcycle, Car, or Gel battery. The charger cycles from trickle current, to pulses, and shuts off when the battery is full. There is no better charger for winter storage battery tending, bringing nearly dead batteries back to life, or just recharging boat batteries slowly overnight.

Finally, I should mention that the current version of the 3300 has some improvements over the already excellent older version (I now have one of each). The latest version includes:
- Heavier gauge wiring
- Much heavier and more durable alligator clips
- A nice zip-up storage case

35 of 36 people found the following review helpful

5.0 out of 5 stars Better than a Battery Tender....... February 17, 2008

By Darthvagrant

This charger, as well as the current (more popular) Battery Tender chargers are both made in China. This charger seems to be superior to my Battery Tender chargers in that it appears to be well sealed, of a more modern design, spark proof. Enclosed in a two piece cast housing, not an aluminum box. The charging algorithms will bring back a sulphated battery in some cases. It has three different charging settings, and brought my sulphated APC UPS battery back to limited life. It is particularly well suited for small motorcycle size batteries as well as larger batteries. It may be left connected indefinitely.
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My only complaint is the cheap power cord that gets as stiff as a broomstick in extreme cold. . . . . $%##@!! cheap plastic covered power cords, anyway!

22 of 22 people found the following review helpful

5.0 out of 5 stars One of the best 12V lead acid chargers made January 11, 2010

By HMMWV TOP 500 REVIEWERVINE™ VOICE

Amazon Verified Purchase

I ordered 2 different chargers to maintain my gate opener's deep cycle battery (a simple 4 output charger with extension cords for charging other deep cycle batteries from amazon Battery Tender 022-0148-DL-WH 12V 4-Bank Battery Management System) and this unit has a far superior charging design.

The 4 bank battery tender does a simple fast rate charge then switches to a trickle charge at a constant voltage with 4 outputs.

This unit pulses the battery under charge and features 3 operating modes with different current outputs for different sized batteries. The selections are motorcycle which also works well for SLA gel cells or AGM batteries, standard automotive starting battery, deep cycle batttery, and off.

What makes the CTEK unit special is that it uses a pulse charge in all modes to attempt to desulphate batteries, while the battery tender does not. This method of charging has proven successful in restoring lead acid batteries that won't take a charge any more.

It comes with a waterproof 12V output cable and a set of clips or rings for permanent installation under the hood of your car. In addition to the LEDs for indicating the type of battery being charged, a second set is provided for empty, 1/2 full, and maintenance pulse charge mode.

There is also a noticable increase in quality between the battery tender and this unit - small details like a water sealed housing and gaskets on the connectors indicate quality in manufacture.

For a single 12V lead chemistry battery this is a useful, well made tool.