GP23A Battery is a 12 Volt alkaline battery that can be used in a variety of electronic devices such as watches, red dot scopes laser sights, digital cameras, night vision scopes riflescopes, key fobs, medical devices & 35mm film cameras. GP23A Battery is cylindrical, smaller than an AAA battery, measuring only 28.9 mm long & 10.3 mm in diameter, with a typical weight of 8 grams; however, this battery must not be confused with a similar single-cell N battery.