@segi_pn said in Battery drain:
Do you use an HR belt?
Yes, two different external HR sensors connected to the watch - Suunto HR sensor and Coros Armband HR sensor.
And yes, when I had a similar issue in the past it was likely caused by the external HR sensor. But what is interesting and different in this case is that the rapid discharge has happened after the watch battery got fully discharged and the watch turned off, then I charged the batter and didn’t have any activities.