BTI Replacement Battery #6 for APC - UPS battery - lead acid - RBC6-SLA6-BTI - UPS Battery Replacements - CDW.com
APC Smart-UPS 1000VA LCD 230V SMT1000I 12V 12Ah UPS Battery - This Is an AJC Brand Replacement - Walmart.com
NeweggBusiness - APC UPS Battery Replacement for APC Smart-UPS Model SMT1500, SMT1500C, SMT1500US, SUA1500, SUA1500US and select others (RBC7)
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