1. they leak all the time, I have had plenty of them leak in and out of devices. 2) they have a use-by date written on the cell, usually 10 years after manufacture. So storing them several years is reasonable to expect. But they go bad much faster. Bah.

Had Duraleaks kill two flashlights within weeks of each other. Batteries were less than a year old.

Fuck Duracell, and all alkalines.

Edit: I take that back. Thank you Duracell for motivating me to get off my lazy arse and read up on rechargeable tech today. Becuase of those bad experiences, I now own only reargeables (mostly nimh), a few 18650, and Lithium primaries.