Amazon.com: APC Smart-UPS SC 450 SC450R1X542 New Compatible Replacement Battery Pack by UPSBatteryCenter : Electronics
Amazon.com: RBC7-UPC Replacement Battery for APC Smart-UPS SU1400, SUA1500, SUA750XL, SUA1000XL, SU1400NET, SU1000XLNET - Scroll Down for The Complete List of Compatible Models : Electronics