1/2 AA 3V Battery, half the size of a standard AA battery and double the voltage (3 volt). 1/2 AA 3V 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 10 years. Suitable for CMOS replacements, diving computers and many other electronic devices. Maximum discharge current of 10mA; designed for low drain applications.