Energizer A544 6V Alkaline Button Top Photo Battery
Amazon.com: ExpertPower 6 Volt 4.5 Amp Rechargeable Battery (EXP645) : Tools & Home Improvement
Amazon.com: 6 Energizer 2CR5 Lithium Camera Photo 6V Batteries : Health & Household
Eveready® Super Heavy-Duty 6-Volt Battery at Menards®
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