Amazon.com: Replacement for Vision CP645 Battery - Replacement UB645 Universal Sealed Lead Acid Battery (6V, 4.5Ah, 4500mAh, F1 Terminal, AGM, SLA) - Includes Two F1 to F2 Terminal Adapters : Health & Household
Mighty Max Battery 6V 4.5Ah UPS Battery for Vision CP645 Rechargeable Sealed Lead Acid 645 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Amazon.com: Vision CP645 6V 4.5Ah Sealed Lead Acid - AGM - VRLA Replacement Battery : Health & Household