Hello,
My Firmware is actually on 4.20 but the problem is same since I have bought the watch (she was on 3.3).
My Watch loses ~3% / 24h while the Watch is off. I use only for run, I can only do 6 activies (four for 1h and two for 1h30) before recharging.
(GPS only, not Glonass, not bluetooth and FCM)
It's not normal.
I did not have it with my previous watches (310xt, 910XT and 620)
Have you the same issue?