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
6 Volt 4AH Rechargeable Sealed Lead Acid SLA Battery 6 volt 4amp - Walmart.com
DE-30008 6V 4.5 amp Rechargeable-Bulk – Los Cazadores
Amazon.com: ExpertPower 6 Volt 4.5 Amp Rechargeable Battery (4 Pack) : Health & Household
Amazon.com: ULTRATECH 640 6 VOLT 4 AMP POWER BATTERY : Automotive