Easy Way to Distinguish Between Good and Bad Batteries

Ever had the problem where your device stops working and you can't tell if it's from the batteries? Fear no more! Here are two great ways to test these bad boys.
Doing a Drop Test
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. Preferably have it held one or two inches above a flat surface, such as a table.
Drop the battery. If it bounces and falls over, then you can assume that it is dead. Dead alkaline batteries have a gas inside that account for this bouncing. If your battery doesn't bounce, or even stands up, then it still has its juice!

Why A Dead Alkaline Battery Bounces!