Battery kit for APC Smart UPS 750 & APC Back UPS Pro 900 replaces APCRBC123
APC SMART-UPS 750 SUA750I Battery Replacement - UB1280 Universal Sealed Lead Acid Battery (12V, 8Ah, 8000mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters - Walmart.com
Adjusting battery float voltage on APC Smart-UPS SUA1000/XL - NissanDiesel Forums