Were they rechargable alkalines? I made the mistake of getting a bunch of them a few years ago (two different brands) and had leaks in about 20% of them. I always used the correct Rechargable Alkaline charger, and just determined they were simply a crappy product. My NiMH 2500MAh and regular alkalines are now the staple of what I use.
Nope, they were not rechargeable. The mouse is still working fine today so at least I know it was just a bad battery.
I tried to find a pic of a fuzzy mouse warmer I saw once that looked a lot like it might be the offspring of the pic above. Couldn't find it.
