Tired of finding batteries have run down on your favorite devices? This strange but true hack will let you instantly know if a battery is good or bad.
Drop the battery from about 6 inches onto a hard surface. If the battery bounces once, it's good and still has plenty of charge. But if the battery bounces around a few times, it's most likely bad. This tip could save you from devices that suddenly don't work when you really need them. And it's a lot less painful than licking a live battery to see if it still has juice.
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