Ah! Battery life on a cell phone. Especially on an Android. Guys, it's all about how you use the phone. What you do? what did you forget? what game did you downloaded that you forgot to turn off in the back? why is the phone set to check for wifi every 15 minutes? I see you have the email set incorrectly.... On and on. Now for HTC One, it generally lasts as long as an S4, and better than most older phones. The HTC One can REALLY suck on the battery juice if you let it. Lower brightness, turn of NFC until you need it. Turn on wifi, and cell data off when it's convenient, same the other way around, keep your phone cool or room temp. Train your battery: Full charge, no playtime, then drain about 4%. Set your sync options for any app or account, to longer intervals, (in email updates, auto-update on wifi only or turn off). Check battery saver to block at what your using, and test. Generally, most users, with moderate usage, to heavy, can get 10 hrs.
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4.3 has further improved battery life, below is screenshot for today, I watched a full movie on Netflix, and a couple of episodes of a show. Still did 6 hours of screen on time and ~18 hrs overall with brightness on auto even S4 with bigger battery can't do that, my dad has S4 fyi.

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