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What is a CR123A Battery?

The CR123A battery is classified by its 34.5 x 17mm or 2/3A cell size, lithium (LiMnO2) chemistry, and high 3V voltage, making them a great choice for flashlights or lithium camera batteries. They're usually button top, and are available as chargeable or non-rechargeable. The non-rechargeable have much higher capacity or runtime compared to the rechargeable version.

CR123 size