The Camelion CR2016 button cell battery is 1.6 mm thin and has a diameter of 20 mm. With a capacity of 85 mAh and a constant voltage of 3V, this lithium battery provides reliable power for devices like car keys, calculators, scales, and small electronics. The steady voltage ensures long-lasting performance, even at changing temperatures. This set contains 5 pieces, so you immediately have a stock for multiple uses or to easily replace when needed.