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Sudden battery drain (less then a day with no activity at all)

Has anyone met a but that leads to extremely fast battery drain while not using the watch ?


I got the watch on 28th of Dec, updated it to 3.30, paired with smartphone and fully charged.
Then left in the box till First of january, not using it at all. When I took it from the box - it was not turning on because of low battery, literally 0% charge.


I charged it and started to use - it worked fine.
I charged it on 6th and used it till 10th (6 full days) including 4 hours of activity tracking (with glonass, 1-sec recording and backlight always on while running at -20 o) - so the battery is alive

Yesterday I charged it again to 100% and left on the table.
It was totally discharged today - in less then 24hrs with no activity happening
So it is second time it happened.

What might be the reason?

I have BT paired - may it be looking for a BT connection and draining the battery (phone was not in range)?
I also have activity and sleep tracking enabled.

If anyone met this problem - please share the solution.


PS: Or is it a charging/ charge reporting issue?
Last charge took not much time (haven't timed it, but I'd say around 1 hour or so), while now it is charging for around 1.5 hours and still has 66% only.
Thank you!