The Sony SR626SW / 377 is a silver oxide watch battery that is perfect for either replacing old batteries or changing the chemistry of the coin cells that you're currently using. With a silver oxide chemistry, coin cells have a lower self-discharge and stable output voltage, which suits powering low draining, continuous use devices. Ideal applications for a Sony SR626SW sized battery include watches, calculators, heart-rate monitors, glucometers, small electronic toys, and key less remote entry systems for cars and homes. These batteries are a niche-size and aren't one-size-fits-all, so make sure that your device is compatible.