The worst thing that could happen before a night dive just did! Your Laser Stick dive light batteries are dead. Never leave for your holiday without some spare batteries. Don't for your Dive Computer need's some too! This 357A button cell battery can be used in small electronic devices like cameras and calculators and watches. Button Cell Battery are a necessity in small electronics such as television remote controls, toys or flash lights and they produce about 1.5 volts per cell. Alkaline Button Cell Battery provides extensive long power life and work effectively in both low and high temperature. They are safe for the environment.High energy density, long life button battery. For use with toys, calculators, cameras, watches, games and other electronic appliances.