Why Body Battery is draining faster when starting with high level even with low stress?

When i start the day with high body battery level (>75) it always drains quite fast dropping to 60 in the first two hours or so, even with low stress levels. But when I start the day with battery around 50 only, it drains very slowly even with the same activities and stress levels during the day. In both cases and very comparable days I end up around 25-25 in the evening. How comes? Why this faster drain when Body Battery is high?

  • I have the exact same thing, no idea what causes it. I think its the watch realizing it made a mistake in the sleep scoring and adjusting throughout the day by draining the body battery less until it gets to the level it was supossed to be at with a correct sleep scoring.