Dumb me... I carry my spare NB-4L lithium-ion batter for my Canon SD1000 in the watch pocket of my jeans and it went through the wash. Sat in the machine all night! I dried it off and put it in the camera, and it worked. But a friend told me not to try and charge it for seveal days, to let it dry out. Have I ruined it? It looks pretty well-sealed... the only possible place water could get in is around the three metal contacts, and even those look quite tightly sealed. These puppies are $62 at Best Buy - ouch!