how long does it usually take after expiration date for battery to begin to leak? (have one expired 1/2007)?

Answer 1

Depends on the quality and use of the battery.If it is a good battery may live a few years and cheap ones be bad way before then. Just check regular and use to they are used up. Rotate old ones into lights or radios that you use more often.

Answer 2

If it's in something, like a cd player, that's just sitting idol it won't take too long to start leaking.