Amazon.com: BatteryGuy HK-3FM-4-5 Replacement 6V 4.5Ah SLA Battery Brand Equivalent (Rechargeable) - Qty of 1 : Health & Household
Mighty Max Battery 6V 4.5AH SLA Multipurpose Rechargeable Battery Rechargeable Sealed Lead Acid 645 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Yaohu 3-FM-4 Battery - Replacement Battery for the Yaohu 3-FM-4 Battery $6.20