Same as previous beta.
Worse than iOS 10 but acceptable.
Loose about 15% extra battery compared to iOS 10 every day.... but in the same time I end up with 65-70% battery.
I am not a very heavy user of the iPhone but I do check and reply to mails, messages daily and I use Facebook and Instagram regularly.
Also, since iOS 11 beta I do tend to play more with the phone so maybe extra 5% is due to this reason.