iOS 8 GM battery life

doublex14

macrumors regular
Original poster
Jul 25, 2014
106
2
PA
Alright so I recently got the GM (I am a registered developer) and my battery life has been absolutely horrible. You see, I was on every beta and from 1-3 my battery and everything was fine, then I got beta 4 and my device took a turn for the worst. Battery went down 2-3% every 5 minutes and I was charging it almost 3-4 times A DAY. The phone would get very hot and I would just have to set it down and not use it. I had to go back to iOS 7 and when I did the battery issue persisted so I had to set up the device like new and download my contacts and photos and stuff manually. This issue has came back and it's giving me stress! I've come to the conclusion that there is something either wrong with my phones' battery, or I should just give it time to re-adjust. Any suggestions? My friend told me to backup, and then wipe, and then restore from backup but I'm not sure
 

C DM

macrumors Sandy Bridge
Oct 17, 2011
47,526
16,028
Seems about the same as it was in iOS 7 on my iPhone 5.
 

FreeState

macrumors 68000
Jun 24, 2004
1,722
110
San Diego, CA
Im on ATT iPhone 5s. I am getting better battery life than I ever did on iOS7. (I installed as a new phone on the last beta and my battery has been great ever sense.)
 

Mabus51

macrumors 65816
Aug 16, 2007
1,333
817
I'm getting terrible battery life on iOS 8 GM as well. iPhone 5S draining about 15 to 20% every hour. According to Usage the offender is the lock screen :eek: not sure what's going on with it. I only noticed because the phone has been in my pocket all day and it vibrated to alert me that the power level was at 20% left.
 

thomaskc

macrumors 6502
Aug 19, 2010
347
0
I am noticing substantially lower battery levels too after updating, and setting up as new phone yesterday. Not sure if its just one of those things or if anything can be done about it. I might try and wipe it again, update and restore from backup... if its crap anyway I may as well get all the apps etc the easy way
 

doublex14

macrumors regular
Original poster
Jul 25, 2014
106
2
PA
I am noticing substantially lower battery levels too after updating, and setting up as new phone yesterday. Not sure if its just one of those things or if anything can be done about it. I might try and wipe it again, update and restore from backup... if its crap anyway I may as well get all the apps etc the easy way
I think I might backup, wipe it, then restore as backup like you said you might, but I'm not sure
 

thomaskc

macrumors 6502
Aug 19, 2010
347
0
looking at my usage, it claims that my mail app is using an insane amount of battery on "low signal" how ever this makes no sense, first of all there is no change in signal compared to when I had ios7, also I spend most of my time on wifi... lost 18% in 1.5 hours this morning.. something is off with the mail app I think.
 

Mabus51

macrumors 65816
Aug 16, 2007
1,333
817
I recharged my phone to 100% and reset my network settings from Settings>General>Reset then cold booted the phone.

background apps = off
Location services = off
Low brightness
Bluetooth off
Wifi off
Reduce Motion on

Spent 3 minutes logging in and typing this. Lost 8% battery life. Something isn't right. I did a clean install no backup. Synced only my contacts. :/
 

Enjoylife1788

macrumors 6502a
Aug 22, 2011
759
97
I don't knnow if it helps but even my iPhone was getting hot and then I resetted all settings and network settings. It's much better after that. Also note that I didn't do a fresh restore.

Give it a shot and see how it works.
 

Mabus51

macrumors 65816
Aug 16, 2007
1,333
817
My phone isn't getting warm. With this kind of battery usage I'd expect it to. Under battery usage it's saying the Lockscreen is taking up 17% of the battery WTF?
 

bkends35

macrumors 6502a
Feb 24, 2013
935
377
USA
Some of you guys are just getting horrendous battery life. I suggest doing a clean install or maybe just wait for the public release then do a clean install.

I got a little over 6 hours of usage on my first full charge.
 

Mabus51

macrumors 65816
Aug 16, 2007
1,333
817
Only thing left I can think of is that TouchID is blazing fast now. With the Lock Screen taking up so much power. That maybe it's something with TouchID on the 5S. But I'm kinda out of ideas.
 

bkends35

macrumors 6502a
Feb 24, 2013
935
377
USA
Only thing left I can think of is that TouchID is blazing fast now. With the Lock Screen taking up so much power. That maybe it's something with TouchID on the 5S. But I'm kinda out of ideas.
Doesn't the lock/home screen just mean the screen being on is draining the battery?
 

Mabus51

macrumors 65816
Aug 16, 2007
1,333
817
One would think. But my screen has been off. I'm watching it drain rapidly even typing this on the phone drained 3% battery.
 

sapbasis

macrumors member
Oct 29, 2008
60
14
The GM is much better for me, still not getting what I did on 7.1, but better than any of the betas. I have 6 hours and 35 minutes of use with 24 hours of Standby on a 5s 16G on Verizon.

I did the following to install the GM:

1. Backed up to Mac
2. Put the phone in UDF mode
3. Install GM
4. Restored from backup

Phone has worked well.
 

sbailey4

macrumors 68040
Dec 5, 2011
3,603
1,789
USA
Any suggestions as to what to do?
Typical fix for this after an update is settings>general>reset>reset all settings. Let it reboot then go back through your settings and set as you want. This does not wipe out any data but just default settings, wifi networks. That is in lieu of a restore and start from fresh. If the reset does not work then restore and start as new may be the only answer. Not that hard to do just a bit of a pita.

for the record I am seeing about the same as iOS7 on a 3 yr old 4s and really is not to bad.
 

oldmacs

macrumors 601
Sep 14, 2010
4,298
5,696
Australia
I'm scared of the battery life. My iPhone 5 has pretty bad battery life already, but my iPad 2 got 23 hours usage over the last week... got a feeling iOS 8 will be the end of that!!
 

bkends35

macrumors 6502a
Feb 24, 2013
935
377
USA
I'm scared of the battery life. My iPhone 5 has pretty bad battery life already, but my iPad 2 got 23 hours usage over the last week... got a feeling iOS 8 will be the end of that!!
Apple is replacing some iPhone 5 batteries for free if I'm not mistaken.
 

oldmacs

macrumors 601
Sep 14, 2010
4,298
5,696
Australia
Apple is replacing some iPhone 5 batteries for free if I'm not mistaken.
Sadly mine is not covered. My father's iPhone 5 is even worse than mine (3 hours 25 minutes from a charge) but it got replaced under warranty a few months back due to a dodgy top button. Not sure if its iOS 7.1 or what.
 

liangchun

macrumors newbie
Sep 10, 2014
2
0
Mine seems to be kinda terrible as well, this is my first charge...
But after realising that I have my brightness at 85% I know why it drains faster than usual compared to on 7.1.2

And also, my 5s has already ran through 200 charge cycles since I bought it on Feb

 

C DM

macrumors Sandy Bridge
Oct 17, 2011
47,526
16,028
Mine seems to be kinda terrible as well, this is my first charge...
But after realising that I have my brightness at 85% I know why it drains faster than usual compared to on 7.1.2

And also, my 5s has already ran through 200 charge cycles since I bought it on Feb

Image
10% down after close to an hour of usage and over 8 hours of standby? That doesn't exactly seem terrible.