Amazon.com: DR. BATTERY F4809A 319411-001 F4812A Battery Replacement for HP Pavilion ZE4400 ZE4800 ZE4900 Series Compaq Presario 2100 2200 Series [14.8V/65Wh] : Electronics
COMPAQ PRESARIO 2100 - HP MODEL CRVSA-02T1-75 SERIES - FOR PARTS | eBay
512MB KIT 2 x 256MB HP Compaq Presario 2100 2100AP 2100CA 2100EU Ram Memory | eBay