YSK that there is an easy way to tell if a AA battery is dead. Drop the battery onto a hard surface from 7-10 cm(3-5 in) .high. A charged battery will hit the ground with a thud and either stand straight up or fall directly over. A dead battery will bounce.
from /r/YouShouldKnow
YSK，有一个简单的方法来判断AA电池是否没电。将电池从 7-10 厘米（3-5 英寸）高的地方摔在硬地上。充了电的电池会砰的一声砸在地上，然后直接站起来或者直接摔倒。没电的电池会反弹。