Tripp Lite UPS Replacement Battery Cartridge 48VDC - UPS battery
Amazon.com: Tripp Lite Certified UPS 48VDC Replacement Battery for SU1500XL, SU2200XLA Online UPS, 18-Month Warranty (RBC48-SUTWR) : Electronics
Amazon.com: Compatible with (4) 12V 7.2Ah - Tripp Lite SmartOnline 120V 1.5kVA 1.2kW SU1500XL Replacement Battery Set by UPSBatteryCenter : Health & Household
Tripp Lite SU1500XL Battery Replacement Kit also fits: SU1500XLCD