Synergy LR521 1.55V 379 Button Battery (Pack of 2)

The Synergy LR521 Lithium Button Cell is a high-capacity replacement battery that's commonly found in calculators, heart rate monitors, wrist watches, thermometers, and other tiny electronic devices. This small size battery is made up of Lithium Manganese Dioxide chemistry that not only supplies the cell with the high voltage required for high-performance devices but also has a very low self-discharge rate, extending the battery's shelf life.

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