Best battery test hack! How to test batteries without a multimeter. This battery trick is very easy to conduct and you need no multimeter or other equipment. Simply drop the battery on the negative terminal - the flat side. If the battery absorbs the chock, then it's full. If it bounces back it is used, dead or depleted. It's easy to determine which battery that is full and which battery that is depleted. But to illustrate this more clearly I will show this in slow motion too.
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