empty battery

i don't know why but i think it's really funny to think of a battery as being "empty." it's either charged or dead (not charged), or something? right?

like, gas tanks can get empty. fish bowls can get empty. but batteries just have invisible stuff. they still weigh the same after they're all used up, right? i don't know. but it made me laugh. call me crazy.

who you callin' crazy?