Checking in from Iowa with my AT&T One. I picked it up on Saturday and have charged it twice since then. I am averaging about 2.5 days per charge, granted I work in an area that I can't have my phone on me but I keep it on and in a pocket with medium to low service. This allows the radios to be switching all the time as the data attempts to connect and receive. *Results vary and may not be typical in all areas :P
I'll keep checking into it but as soon as I am off work, I have been using the phone intensively: cutomizing, setting up and testing new features. I would say in 5 days, I have done pretty well.
-The iPhone did...Android does
"Where you came from doesn't matter, it's where you are going that does." - John Dillenger