2PCS Tadiran TL-4955/TL-5955 2/3AA 3.6V 1650mAh Thionyl Chloride Battery Power
Chemistry: Lithium Thionyl Chloride (Li-SOCI2). Capacity: 1650mAh. 2pcs Battery. The storage area should be clean, cool (not exceeding +30 Deg C ), dry and ventilated Don't use different models of battery in series.