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"Moreover, the default mode for the shifters and derailleurs is 'sleep'. A button push instantly 'wakes up' each shifter's transmitter, and that signal correspondingly activates the uniquely paired receiver.
SRAM's patent documentation doesn't outline specifics in terms of run time but it does claim a power draw that's just one-tenth of a wireless system that's always on. The automatic sleep mode means users won't have to manually shut things down, either, as is required for Campagnolo EPS."
hippy
@user65185
From Bikeradar so it must be true:
If you sneak up on an unsuspecting eTap group and ever so gently touch a shifter without moving the bike in the slightest, nothing happens. The group is sleeping. Accelerometers in the derailleurs wake the group at the slightest movement and keep it awake for a time even when still. When you are riding, it’s always awake.
This auto-pause feature allows for a longer life (a claimed 60 hours or 1,000km) with the 24g battery.