Universal Avo minor MODEL 1 U10 IEC R12 No. 30 Battery 1.5V Eveready U10 R12S
Also known as: Energizer U10, Everready U10, Eveready No. 30, Ever Ready Number 30, IEC R12, R12S. Take care not to confuse it with the Burgess U10 which is a fifteen volt, 15V, battery. These U10 or R12 batteries have a long shelf life.