You want to use the battery tender junior for snowmobiles, atv's and motorcycles. It puts out 750 milliamps which is less then 1 amp. You can not charge a dead battery with a battery tender junior. Charging a dead battery will burn the battery tender junior out. The junior is designed to maintain a battery at approx. 12.8 volts. If you are going to use one on a car battery you will want to use the bigger battery tender which is designed to charge a dead battery and maintain approx12.8 volts.
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