The Varta silver oxide SR 1.55V cell is a specially designed watch battery. * Alternative battery types: SR731SW, SR731,V329, D329, RW300, R329/24, GP29, 329A, 329X, E329 * Battery & PSU technology: Silver oxide * Battery size: SR731 * Battery type (category): Button cell * Capacity (mAh, Ah): 39mAh * Dimensions, height: 3.1mm * Dimensions, Ø: 7.9mm * Voltage: 1.55V