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6 X Duracell DL2450 Lithium Coin Battery, 2450 Size, 3V, 540 mah Capacity - Walmart.com
Amazon.com: Duracell 2450 3V Lithium Battery, 1 Count Pack, Lithium Coin Battery for Medical and Fitness Devices, Watches, and more, CR Lithium 3 Volt Cell : Health & Household