Living up to Energizer's high standards, the CR2032 3V Lithium Coin Cell is a shining example of power and reliability. With an impressive 240 mAh capacity and a shockingly slow discharge rate, these coin cells are able to provide the consistent power needed to operate smaller devices like car alarms, glucometers, calculators, and watches. The battery's Lithium Manganese Dioxide (Li/MnO2) chemistry is incredibly safe, taking the place of more unstable chemicals like mercury previously found in batteries. The CR2032's chemistry also gives it a considerable shelf life of 8 years, allowing them to be kept around the house for when you need them most. Great for Guitar Tuners.