The Panasonic CR1616 Lithium Coin Cell is a powerful, pint-sized power source designed for use in heart-rate monitors, remote starters, and other small devices. The battery uses a potent Lithium Manganese Dioxide chemistry, which not only allows the cell to produce the high voltage needed for high performance electronics, but gives it a respectable 55 mAh capacity to keep your device running longer. The CR1616 has an astonishingly low self-discharge rate, giving it a lengthy 10 year shelf life and allowing spares to be stored around the house or office until they are needed.