Lawrence, Any chance of a step by step guide to ''fixing it yourself'' as it '' isnt that hard''.
Just spent hours deleting exchange accounts, calenders etc as suggested, then resetting the phone to new without a back up reinstall and the problem remains.
A laymans terms, ''it isnt that hard'' fix would be genuinely greately appreciated.
I just dont get it.
I'm not convinced it is an Email problem. I've had all my account link to my iphone, including 2 exchange before the update and never had the battery drain. Never had the issue until update 6. I've killed every process, drained the battery, recharged completely from the wall, turned off all services, background processes, PAN hardware, WiFi hardware, cellular data, 3G, reinstalled the IOs and restored the iphone like every discussion claims to be the problem but no success. How is the iPhone draining with almost no processes running? Didn't reinstall any applications. I'm not even using the phone and it is still warm with rapid drain. I'm only fortunate to have an andriod for backup to make a phone call because after a few hours Iphone is dead completely when it was on standby. My iPhone is now just a paper weight until a patch or hotfix is available. Does anyone have a working solution? Thanks.
This was my lab all day:
Standard Config with 4 mail accounts (exchange, gmail, hotmail and icloud) and push enabled:
7:00 AM -> 99% battery
9:36 AM -> 47% battery (1% lost every 1,8 minutes)
Disable push and set Fetch every 15 minutes:
9:36 AM -> 47%
11:00 AM -> 39%. That was working! (1% lost every 10,3 minutes)
Then i charged the battery phone again to 99%, reboot the phone (On+Home) and enable push:
3:59 PM -> 99%
4:45 PM -> 89% This was better than the first state but not a good time (1% lost every 4,8 minutes)
Remove Exchange and reboot the phone:
4:50 PM -> 88%
5:24 PM -> 78% Worst! (1% lost every 3,4 minutes!)
Remove all the mail accounts, reboot (again) and reconfig all the accounts:
5:52 PM -> 73%
6:31 PM -> 67% (1% lost every 6,5 minutes) Not the best, but better.
I estimate that the final config have 10-11 hours of battery on standby
The best config without push can make 17 hours.
All the lab was executed with an iPhone 4S and the 6.1.2 version
The conclussion: Push is the responsible
you seem to know a lot, but you are very wrong in this case. This battery drain issue is directly related to recent IOS updates, it's documented all over the place and even acknowledged by Apple, that's why they released 6.1.2. I had battery drain on my iPad with 6.1.1, 6.1.2 fixed it. However now my iPhone, which was previously unaffected by 6.1.1, but upgraded to 6.1.2, is now draining battery in standby 10-15% every 20 minutes.
I know you thing that somehow this case is different and it really IS 6.1.2. If it is, however, why is my battery life unchanged with 6.1.2? And what about all of the people in these threads and messages over the past 5 years who just KNEW that the problem was whatever version they had just upgraded to?
Here's a list of complaints similar to your going back 5 years:
Possibly because no two phone images are identical and if it is an IOS bug, it's not consistent across all phones because there are too many variables, apps , settings, etc. Apple can't possibly QA every version of IOS on every phone image. There is something on my phone and many others' phones that activates this bug. Just an (un)educated guess.
I don't know if this solves other people's phone problems, but it totally worked for me. I deleted icloud, gmail, hotmail and exchange accounts, reset network settings, and then reinstalled all mail accounts with normal config (including push notification). This morning I was losing power 1% every 2 minutes on stanby--I timed it and got really really scared because my phone was essentially a paper weight when it wasn't plugged in--and now I am losing power 1% every 15-16 minutes. Incredible!! Thank you Lawrence.
I wish everyone else luck with your troubleshooting! I'm also going to recalibrate my battery tonight to see if there is increased improvement.
my phone was in ios 6.1 and the battery lasts a day. 2 days to be precise. a limit of texting.
A movie marathon = lasts 6 hours
music player = listening to music player at 12 AM GMT +8 @ 56% until woke up at 7 Am GTM +8 with 44%.
texting lasts more than a day.
Wifi = 3 hours or more.
wifi + online game = 1 hour or more.
also you should set as new phone during restore or upgrading since you have Icloud back ups.
I did it after I upgraded to ios 6.1. The battery became good than ios 5.1.1 (restored the back up from 4.3 that's why i have battery issues).
I disabled my Exchange based calendar earlier today and the battery drain ended. Haven't yet re-enabled it to see if the drain starts again but it seems to have been cause by my work calendar. The 6.1.2 release notes specifically said this was the reason for the update but it doesn't appear to have worked, at least for me.