At least for me. When it tells me I'm a bit run down, it's been spot on. 2 days ago it was very low, but I felt good. So i went on my normal run. Ended up pooped and walked a lot. Got a really solid night sleep, battery showed that I was good, sure enough I had no problems.
I really like this. Finally something that gives me another piece of information which is helpful.
Fully agree on this. Body battery is very accurate for me too.
(If only calories count worked as it should)
I've noticed that, too. It's actually pretty amazing how well it seems to figure your sleep quality into the body battery calculation. Sometimes an alcohol-related poor sleep-quality night has resulted…
Maybe it has a secret camera recording those beers and wines
Had a hangover recently and my fenix pointed out a flatline as a result of the poor sleep 
. Works very good for me too. Useful feature.
Yeah, that'll do it 
I've noticed that, too. It's actually pretty amazing how well it seems to figure your sleep quality into the body battery calculation. Sometimes an alcohol-related poor sleep-quality night has resulted in my body battery dropping instead of going up overnight - which is probably accurate considering I felt much worse the next morning than I did the night before 
If you think about it, it's seriously impressive for a watch to be able to figure that out, considering there's no way it knew I was drinking the night before.
With all the problems we've had with sync issues from Garmin Connect the past week. My battery is getting low
Maybe it has a secret camera recording those beers and wines 
