Yeah, I just got my Anker x2 plus wall charger for like 25 bucks on amazon, plus the Prime trial gave me free 2-day shipping.
I guess my usage would be considered heavy. Between 7am and 4pm I'm on airplane as my building gets zero reception and saps my battery searching for a signal. I might use my phone for 20min outside but that's about it. After work I tend to spend a lot of time on Tapatalk forums, facebook, angry birds, Monopoly, Words/Scramble WF and just dicking around with my screen on. Usually my battery life is solid (95%+) all day and then by 10/11pm it's around 30%, but then I have to charge it as it's my main alarm clock. So I don't get good opportunities to just let it die and fully charge, especially since the battery screen won't turn on while the phone is powered down and charging. I think that effects my calibration and whatnot.