Having extra batteries around is a great idea. But you need to stored them correctly in order to be sure they are ready for use when you are ready for them! According to the experts, do NOT keep them in the refrigerator, as condensation can cause damage. Instead, keep them in their original container or rubber banded with all positive ends pointing the same way. Or put them in a plastic bag and keep them away from metal objects like your keys, which could cause electrical shorting.