Xpressbatteries.com offers replacement battery cartridges for all American Power Converision back-up units. Our XBC cartridges offer the ease of one click shopping and quality at an affordable price. No more guessing at how many batteries your backup unit takes! All our XBC cartridges are direct battery replacements for APC's RBC part numbers and are guaranteed to meet or exceed OEM specifications. Simply add our XBC cartridge to your cart and when it arrives, replace your old batteries with your new cartridge. All XBC cartridges are guaranteed to be 100% compatible and carry a two-year replacement warranty.