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
HKbil 3FM4.5 6V 4.5Ah Sealed Lead Acid Battery - This Is an AJC Brand Replacement - Walmart.com
TOYO 6 Volt 4.5 Ah (3FM4.5) SLA Battery With F1 Standard Terminal – TOYO Batteries
MIGHTY MAX BATTERY 6V 4.5AH SLA Replacement Battery for Long Way LW-3FM4 MAX3942599 - The Home Depot
MIGHTY MAX BATTERY 6V 4.5AH SLA Replacement Battery for HKbil 3FM4.5 - 3 Pack MAX3823090 - The Home Depot
3Pk Long Way LW-3FM4.5 6V 4.5Ah Sealed Lead Acid Replacement Battery | eBay