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
Replacement UPS Battery Set for SMART-UPS SUA1500 APC - (2 batteries - 12V 18AH)