My version is apparently APD1, but I am noticing a slightly more battery drain than usual and I really don't get what could be causing my battery to drain when it's not being in use. Yes, I play games, and I expect a drain when I do, but not when my phone is sitting idly and still draining for whatever reason. I don't even wear my Gear S2 watch anymore because I'm afraid it'll drain it faster and I don't like charging my phone all the time either. I don't use bluetooth or wifi or location (but only when necessary, if I'm going somewhere I don't know, I map it). My brightness is on auto and not set too high (around 10% I believe in brightness). So, with all that said, I still don't get why it drains faster than it should. I know I shouldn't care but it wasn't like this before the AT&T update so I think that messed up the battery life, for me. That's the only thing I can think of because my usage has not changed since I got the phone. All in all, I hope it gets better. I've done all the cache partition and storage cache wipes over the past month. I've done I believe 5 cache partition wipes in total. It fixes it for a couple of days, then there's one day where I notice my battery going down really fast and I can't pinpoint what is causing it. I love this phone and I really am not trying to let it bother me - I purchased a battery pack from Samsung just in case it does die on me when I'm out and about. I just hope that there's a fix for this or something.