why completely used up batteries seem to have a small bit of energy again after some time.
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Could be they are just cooling down which would let them last a little longer because of reduced resistance. That being said normal batteries like AA, AAA, D, whatever never get close to being completely dead, they just fall below the useful voltage. Lots of time this means they are full at 1.5 volts, and dead at 1.0. If you wanted to jerry rig 2 dead batteries together you’d end up with a good one
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