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My battery life on my 6+ has been great since doing an iTunes update for 8.1.3 and getting rid of the Facebook app. (I just use it through Safari now.)
 

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Not happy with my battery life
It' is a 6Plus though
But even for a 6Plus I get worse battery than some regular 6View attachment 531148

Your signal is pretty bad. -105 is not good to have. That will negatively affect the battery
But since you're on T-Mobile, you can take advantage of wifi calling. You can put your phone on airplane mode + wifi and still receive texts and calls through wifi. That should improve battery life
 
What was your brightness? -105 shouldn't affect things, especially when you're connected to Wi-Fi (not sure how long you were on it, though). Spotify streaming is noticeably worse than local playback (obviously)


Brightness is usually 30% that max is about 50% but I don't always have it at 50%
And I'm on wifi as much as I can be. At home it's always wifi. I too seem to have forgotten if I went out and lose wifi. Oh no I didn't t was raining in my city so I was home for the whole cycle that's in the screen shot.
And will it make a difference if the spirit music is stored on the phone? I have it stored but I think it will still slurp more battery than the built in music app will. I will try to switch to wifi calling like they said above to see if anything changes.
I did do a restore as new phone yesterday to see if that hopefully helps.
 
6+ for today. Averaged 2 bars (around -114). Decent I'd say. 100% LTE, except for about 20 minutes of hotspot usage.
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iPhone 6, Currently on 8.1.2 and a backup from my 4S. I've had the phone for 3 weeks now and it seems the battery is getting worse. It's not draining fast or anything, at least I think. I don't have any screenshots from before but it seemed i got 8 hours of usage.

Mostly on wifi today. I mean, it's not like it's going to die soon or anything, but I just don't know :/ What do you say?

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Did an DFU restore and updated to 8.1.3, set up as new also. I was getting 5 hours usage most of the time, I hope it keeps like this now.
 

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iPhone 6, Currently on 8.1.2 and a backup from my 4S. I've had the phone for 3 weeks now and it seems the battery is getting worse. It's not draining fast or anything, at least I think. I don't have any screenshots from before but it seemed i got 8 hours of usage.

Mostly on wifi today. I mean, it's not like it's going to die soon or anything, but I just don't know :/ What do you say?

Image

That's actually pretty good and about normal. You're on pace for about 7+ hours of usage and that looks about right for the 6.
 
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