CR1/2AA 3v Lithium Battery, half the size of a standard AA battery and double the voltage (3 volt). The CR1/2AA 3v Lithium Battery, or CR14250 battery uses Lithium Manganese Dioxide chemistry for a high energy density and a wide operating temperature range of -40°C to + 85°C. Self discharge is low at less than 0.5% per annum at 20°C, giving an effective shelf life of about 10 years.