@thanasis this is interesting and I’m observing something similar. After the last update on Tuesday, I noticed big drops (3 or 4 pp) in battery charge hours after finishing a running activity with a HR belt. When I didn’t use the belt, discharge was slower.
I usually wash my HR belt after running and hang it in the shower; I think the watch keeps connecting to it. Last Sunday I wanted to do some yoga with my daughter after my run, and I couldn’t use OHR because the HR belt was still connected. Strange thing, though, the discharge I observed this week happened while the watch was with me at work, and the belt at home.