Comment by eternityforest

Bluetooth could have such a tiny power draw if they would just have lower update rates.

I don't see any reason things like watches and tracking tags in some couldn't have 10yr life on a coin cell, or like 30 years with an LTO you charge monthly.

Deep sleep currents can be in the nanoseconds, and we only need power for a few milliseconds every minute to transmit an "I'm here" beacon.

Step counts and heart rates are different, but even that can be optimized a lot if you don't need 100% perfect data