Sorry in advance if this post is not in the right section, but I couldn't find one that dealt with batteries. Anyway, I ordered a new Sony NH-14WM from Minidisc Canada, and I got it today. I inserted it into my Sharp MT-877 as I would with any other NI-MH gumstick, to charge it up. All seemed to be going well, when about 3 hours later, I heard a "pop" sound. I didn't really know what it was, and I thought nothing of it until it indicated that the battery was charged. After removing the unit from the charging cradle, i noticed that it had a bulge in it where the battery was. To make a long story short, I couldn't get the battery out without partially disassembling the recorder, because it had "exploded", but not leaked...it just "puffed-up". I don't get it....is this just a fluke defect, or did I somehow screw up something as simple as attempting to charge a battery?!?