http://cm.ebay.com/cm/ck/1065-29296-2357-0?uid=69350&site=0&ver=LCA080805&item=8737583109&lk=URL
The original Newton Messagepads had sealed battery packs. When they died it
was about $50 or so to get a new one. I have a box of the replacement part,
4-Cell AAA Battery Holders. You supply the rechargeable batteries...