For devices where traditional batteries cannot be used, Lithium Coin CR2025 has a proven track record. These batteries are useful for memory back-up, digital watches, calculators, car keys, fitness appliances, laser pens and medical devices like a tensiometer and a clinical thermometer. The Panasonic lithium coin CR2025 battery has a high voltage of 3V and an ultra-compact design. This means that a single lithium battery can replace two, three or more traditional batteries.