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CR1220 12mm Diameter - 3V Lithium Coin Cell Battery - CR1220 is the highest quality & capacity battery, the same as shipped with the iCufflinks, iNecklace, Datalogging and GPS Shields, GPS HAT, etc.
Note: Brand may vary but all battery brands are verified to have the same nominal voltage of 3.0V and nominal capacity of 40mAh
Adafruit Product Page: https://www.adafruit.com/products/380