An Amazingly Simple Way To Test If a Battery Is Dead
It turns out that when the alkaline in a battery wears down, it produces
a gas that fills the inside. So if you've got a box of random batteries
you want to test, and don't have access to a voltmeter or any other
device, you can simply drop them vertically a short distance onto a hard
surface.
A charged battery will make a solid thump sound and often
remain standing, while a dead battery makes a muffled sound, bounces
repeatedly, and then topples over.
Via: http://gizmodo.com
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