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https://seasonalcommute.com/2015/02/16/di2-battery-life/
"Two, the current draw while off is small enough relative to the other loads that it can be ignored. With these numbers the system could sit for over three years before the battery is discharged."
hippy
Di2 supposely have a sleep mode, but I don't think it work as well as they said, as the battery drain after months of inactivity.
I'm gonna look into this more, eTap sleep when not in motion (not useful if you want to move it).