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UPG 6-Volt 4.5 Ah Sealed Lead Acid (SLA) AGM Rechargeable Battery UB645 - The Home Depot
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Amazon.com: Duracell Coppertop 6V 908 Alkaline Lantern Battery with Spring Terminals, 1 Count Pack, 6-Volt Battery with Long-lasting Power for Household and Office Devices : Health & Household