A power supply is configured with “smart” technology compatible with functionality on metrology hardware, like gas meters. This technology enables functions on the power supply to retain and generate data. The data may characterize discharge of an energy source, like batteries, that is resident on the power supply. Other data may indicate charge levels that are commensurate with ambient storage and use conditions, for example, to identify effects of “self-discharge” that may occur on the power supply after manufacture but before use on the gas meter. In one implementation, the gas meter may process the data from the power supply to track connection (and disconnection) of the power supply, set life expectancy of the power supply, and manage maintenance on the device as necessary to pre-empt issues that may occur at the end-of-usable life for the power supply, among other favorable functions.