Battery kit for APC Smart UPS 1500 replaces APCRBC133
APC BackUPS Pro 1500 International 12V 9Ah UPS Replacement Battery | eBay
Amazon.com: UPC UPGRADE PARTS COMPANY RBC7-UPC Replacement Battery for APC Smart-UPS SU1400, SUA1500, SUA750XL, SUA1000XL, SU1400NET, SU1000XLNET - Scroll Down for The Complete List of Compatible Models : Electronics