The battery life of the features battery (smart functions) or nevo is greatly dependent on use case but is up to 2 months or more. The timekeeping battery will last 4-5 years on average.
There are a few special considerations regarding battery life for smart features. First, constant use of notifications can drastically reduce battery life. It is recommended that you turn off notifications when not necessary. This will greatly extend the battery life.
However, the largest drain on battery occurs during firmware update. Our DEV team is working on less power-intensive update procedures that will greatly improve this situation. Please bear with us as we develop and improve the nevo hardware and software.
Thanks for your patience and understanding as we work to improve nevo!