In this document, we presented the states in the life cycle of a Sleepy End Device, and a method to estimate battery life.
Particular focus has been given to radio activity, and the typical application layers for Thread, Zigbee, and IEEE 802.15.4. We have given a mathematical model, that when combined with the measurement methodology presented, can be applied to any application to calculate battery life. The Power Profiler Kit measures sleep current and charge of dynamic radio events. You can apply the mathematical model, combined with the measurement methodology presented, and calculate expected battery life for your device and application using known sleep current, radio, application event periods, and their average charge values.
Even in the worst-case radio scenario, we have shown that the small CR2032 battery can power a SED sending a large packet every minute for up to a year and a half. In some of the scenarios we tested, the CR123A battery can provide up to 10 years of battery operation.