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Short money to get you out of a jam. I purchased one of these to carry when I snowmobile or go out on the bike. Small, powerful and very portable. Not near the deal you got.
battery tender about the same price - I keep mine plugged in when ever park - batteries last 5 years
Two different purposes. Battery tender is to keep your battery at full charge when stored for extended periods. Tends to make your battery last more years.
Jumper is designed to start something with a dead battery when you do not have jumper cables or another car nearby with a good battery.
Also triples as a flash light and a way to recharge your run down cell phone in an emergency.
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