Get the battery you suspect is dead. If you have have a device that harbors multiple batteries, it would be a good idea to test all of them. Keep in mind that this method only works for alkaline batteries, more specifically the AA and AAA models. Hold the battery with the negative terminal (flat side) facing down.
This electronics tip has to deal with checking common alkaline AA/AAA batteries or AA/AAA rechargeable batteries for proper voltage with a voltmeter.
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