I would not even begin to know where you could purchase an actuall original battery replacement for the Nevo SL. But I do know there are battery shops and I'm NOT talking about radio shack, that do alot of special order and have off the wall stuff that may work. I would take the original to one of those places and see if they can get one for you. I needed one for my handheld Ipaq 3700 series pocket pc.........it was a little gel pack battery and they had it on the shelf.

just an idea........it may not work but would definately be worth a phone call or store visit. The place I have used is ALLPAK. There may be others.