I upgraded to 5.1 yesterday and immediately noticed my battery going down super fast. I killed all running apps at 37% and then sat my phone down(a 64gb 4S btw) and picked it up 10 minutes later and it was down to 31%! So I went to bed around 11pm and plugged it in as usual to charge. I happened to wake up around 2:30, so just to experiment I unplugged the phone (it was at 100%) just to see what it would be when I got up in the am. Well, just woke up around 8:30am and the phone is completely dead! Thats right, completely dead after 6 hours of stand-by with no background apps running at all. I looked right away on this forum expecting hundreds of similar posts from the new upgrade but found none! Any ideas?