I have read that several other people complain about their battery draining overnight when shut down. I also noticed this with my phone. I've had it for about a month now and after the first few days the battery performance went up substantially and went from dying after half a day to lasting a 30+ hours of moderate use.
That said my battery drains faster when i shut it down before bed. I did a test, after fully charging it before bed I powered it down. When i turned it on the next day it was at 60%. The next night i charged it and left it on all night. It only drained about 20-30%.
Is my phone defective or is there just no point to shutting it off. Also does the phone reboot once its been on for several days? I had it shut off and turn back on as i was using it today.