« RBC21 APC RBC21 Replacement Battery for APC BackUPS BF250 BF280 BF350, PowerStar® Brand Batteries By PowerStar Ship from US - Walmart.com
Equivalent of APC RBC21 Battery, ! Better than but not an apc battery, 2 year warranty. Brand new replacement battery cartridge. Consist of (1) 12CE5T.., By Hi-Capacity Ship from US - Walmart.com
Amazon.com: RBC21 - 12V / 5.5Ah Sealed Lead Acid UPS Replacement Battery - BBBP5512RT : Health & Household
BatteryJack PowerStar HZS12-5-06 HC1221W CSB Battery for APC ups RBC21 BF500 500U 400C at Lowes.com
Upgrade Parts Company UPC RPLCMNT BATT CRTRDG # 21 (RBC21-UPC) at TigerDirect.com