The Maxell 315 watch battery is part of the company's SR collection of silver oxide button-type batteries. This particular button cell battery, also known as the SR716SW, is designed to power low-drain electronics. We recommend using this non-rechargeable battery within your analog watch or calculator. The Maxell 315 features a silver oxide chemistry, which provides a stable discharge current that won't vary in voltage. In fact, the flat discharge rate of a silver oxide battery is designed to provide the same voltage level until the end of the battery's life. Alkaline batteries, on the other hand, offer a more slopped discharge characteristic that lowers the voltage over time, therefore lowering your electronics' performance as well. This is why it is important to replace silver oxide button cell with batteries of the same chemistry so that your devices' maintain optimal efficiency.