Mighty Max Battery ML4-6- 6 Volt 4.5 AH, F1 Terminal Rechargeable Sealed Lead Acid 645 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Amazon.com: Universal Power Group 6 Volt 6V 4.5AH Rechargeable Deer Game Feeder Battery - 2 Pack : Health & Household