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.