Palm Pilot Professional 3com Battery Replacement - iFixit Repair Guide
Palm III - Wikipedia
HQRP Replacement Internal Li-Ion Battery for All Palm III / 3 , IIIc / 3c Series PDA + Screwdriver for battery installation plus HQRP PDA Screen Protector - Walmart.com - Walmart.com
TIP: If you want to replace the battery in an old Palm IIIc, replace it with a Battery from Cameron Sino which was originally designed for the Garmin iQue 3600! The connector
Amazon.com: VINTRONS Replacement Battery for Palm IIIc, IIIxe, Viic, IIIe, III, IIIx : Electronics