Amazon.com: Tenergy 1.5 Volt Battery Button Cell LR41, ag3 Batteries Equivalent, Ideal for thermometers, Watches, Laser Pointers, Small Toys, Portable Electronics, and More - 100 Pack : Health & Household
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World's tiniest battery could power computers the size of a dust speck
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World's smallest battery can power a computer the size of a grain of dust