Xeno Lithium Thionyl Chloride Battery, Xeno XL-050F - 1/2AA (ER14250) - 3,6V 1200mA LI 1/2AA 1200MAH 3,6V XENO (XL-050F) Brand New Full Manufacturer Warranty Dimensions: 0.56"L x 0.56"W x 1.00"H 3.6 Volts 1200 mAh