Mighty Max Battery Replaces cp0660 gp645 lcr6v4p hk-3fm4.5 wp4-6 Rechargeable Sealed Lead Acid 645 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Amazon.com: NPP NP6-4Ah F1, 6V 4Ah AGM Battery Rechargeable Sealed Lead Acid 6V 4 amp Battery Replaces cp0660 gp645 lcr6v4p hk-3fm4.5 wp4-6 for Ride on Toy, UPS, Alarm System, Control System F1