I don't usually use my Magic Trackpad, so I leave it turned off. Looked at it today and noticed what I first thought was dust around the battery compartment opening. I wiped it off, and then realized it was from a corroded battery. I tried to open it, but it is sealed shut. Even used a large screw driver (which dinged up the cover a little) and it won't budge. Anyone know of a way to loosen the end cap?