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
APC REPLACEMENT BATTERY CARTRIDGE #7 FOR SUA750XL, SUA1000XL & SUA1500
Amazon.com: APC Smart-UPS 1500 SUA1500I 12V 18Ah UPS Battery - This is an AJC Brand Replacement : Electronics