Amazon.com: Energizer Energizer Max 6V Lantern Battery (529-1) : 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
6V Lantern Battery | Energizer Eveready, 1209
6-Volt Spring Terminals Heavy Duty | 944 - Rayovac