If you dig below the frost line, and ensure that your container is properly sealed, no problem... batteries, water, or anything else that doesn't have a long shelf life aren't good candidates for caching.
Nobody ever said it was easy <img src="/images/graemlins/shocked.gif" alt="" /> <img src="/images/graemlins/wink.gif" alt="" /> <img src="/images/graemlins/grin.gif" alt="" />

Troy