RBC2 APC UPS Replacement Battery for the BACK UPS CS5000 CS500 and BK500EI | MDS Battery
Apc Back Ups RS 600, 500 opening and Battery Replacement - YouTube
APC BACK-UPS CS 500 BK500 Battery - Replacement UB1280 Universal Sealed Lead Acid Battery (12V, 8Ah, 8000mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters : Amazon.ca: Health