So my work has me travel occasionally and this weekend I was up in Lewiston, NY by Lake Ontario. I worked 12 hours each day outside. I had my phone hooked up to my car charger on the way up both times so when I got there it was fully charged. With some light to moderate use (Listening to Pandora, web surfing and making calls) the battery went from 100% to 20% in less than 3 hours. I threw my phone back on the charger for 2 hours and it only increased to 40%. I made a phone call that lasted for 15 minutes and the battery went from 40% to 15%. I did a battery pull and when I turned the phone back on it reported 60%. Decided to play some music off my SD card and the phone only lasted about 10 songs before I got the 15% warning.
After that, I decided to charge the phone fully before using it again. By the time it was fully charged it was time for me to leave. The phone lasted the entire night back at my house with heavy use, I was really trying to push it and by the time I went to bed 6 hours later the phone was at 60%.
Went back to work the next day and the same thing happened, the phone would not last more that a few hours and I had to recharge it several times. Get back to my place and the phone was fine. I had full bars where I was and not roaming. I'm kinda dumb founded at what was happening.