I had PB3 installed on my iPhone 7+ with Watch OS 4 Beta 3 on my Apple watch and everything seemed ok. Did a DFU restore to iOS 11 Dev Beta 4 and ever since than my iPhone battery life has taken a big dive. iPhone battery @ 50% overnight, not plugged in Wake up to dead iPhone Unpair Apple watch, repeat the same process, battery @ 46-47% in the morning. Not sure why this issue exists on a NEW setup (both iPhone and Apple watch) of Dev and yet it was working fine on PB3. Update: restoring PB3 and going to repair Apple Watch and run the same test again overnight to see what it does. Update 2: So far with PB3 (restored dev 4 backup) I have not seen any battery drain issues.