Varta SR54 Button Battery, 1.55V, 11.6mm Diameter
6mm Diameter, Chemistry: KOH Electrolyte, Silver Oxide, Zinc, Capacity: 81mAh, Terminal Type: Standard, Dimensions: 11.6 x 3.1mm, Model Number: V389, Series: V MF, MPN: 20389903501.Varta SR54 Button Battery, 1.