This 3.6 volt lithium battery AA is size to fit inside of your compact business electronics that require the power of lithium;Designed for tracking devices, automatic meter reading devices, memory backup, security/alarm systems and computer real time clocks;It is important to note that this lithium thionyl chloride battery is not rechargeable;Recycle with us! Bring your old dead batteries to your local Batteries Plus location for proper disposal. Fees may apply.