X Trustworthy Source United States Environmental Protection Agency Independent U.S. Coin and button batteries are small and round, and they're used to power very small devices like watches, hearing aids, and computer components.A 9V battery looks like a small box with snaps on top, and it's often used to power devices like smoke detectors and walkie-talkies.D is the largest 1.5V battery and usually charges larger items like flashlights. ![]() ![]() AAA is the smallest traditional 1.5V battery, and is usually used to power small electronics.
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