Question: Q: Iphone 6 Battery Drain Bug (Found ?)

Did you get a chance to try this?? I am dropping 8% in a 10 minute span with Wi-Fi calling on. Strangely enough my phone did not seem to be draining as fast on my home wi-fi, I need to try and do my timings at home tonight.

Wi-fi calling is definitely a HUGE drain for me, but even with it turned off, the battery life is poor.

I would not pay too much attention to that new battery usage page in ios8 - in my opinion it seems very poorly designed. It does not actually tell you what is draining the battery, just what app or screen is on top when the drain is occurring. Try this, open your messages, calendar or even a blank notepad up and it will appear that it is doing the drain when it is not. Worthless. I think Apple is trying to give Microsoft some competition for broken bloatware! RIP Mr. Jobs, we miss you!

I tried a restore, it did not work for me.

I just ran a series of tests an the Wi-Fi calling battery drain only happens with the phone screen turned on. My screen brightness is down at 60% so keeping the home screen open obviously activates something else...

Well, after more trail and error and reading other sites it seems like my issue is Wi-fi related - whether it is hardware or software I don't know. I noticed when on my home wireless my drain is minimal in comparison , but at my office it drains extremely fast.

At home I am using a 802.11 "N" router - drain is about 6% per hour - screen on - phone not being used

At work I am using a 802.11 "G" router and my drain is about 45% per hour - screen on - phone not being used

I think my OS either has bad hardware of Apple needs to re-write their wireless drivers for the "G" protocol.

My appointment with the Apple geeks is today so I am going to ask for a new phone and see how it goes.

Hope this clue may help.

Well I went to the "genius bar" and the apple kid did their faulty diagnostic test on my phone and arrived at the solution that my home screen sitting idle at 60% brightness was the problem. he then informed me that the phone won't last 2:30 minutes with the screen on, sooooo, when I asked him to explain why apple specifies up to 11 hours of internet surfing or video playback he was stumped and told me my phone is working as it was designed. He would not swap it for another one and said may still be able to return the phone to T-Mobile if I did not like it.

Great Job Apple!

Did you ever get to doing a fresh install? I was also wondering if you might be on a 802.11G wifi when you are having this issue.

I found another thread here that discovered that the phone drops the wi-fi calling when the phone is asleep, so that is why it takes a few seconds to appear after you awake the phone.

Wi-Fi and Apples wi-fi drivers are broken. If anyone is having this same issue just turn your wifi calling off and see if it clears up the problem. Type "G" routers are another problem as well.

If this is you don't waste your time listening to the Geniuses and re installing everything on your phone as "new" it does not help. remember these are the same Geniuses that told you all you had to do when upgrading was to restore your phone from backup and it would be the same as new.

Here is the other thread if interested:

iPhone 6 Wifi Calling Problems (T-Mobile)

UPDATE:

6 days have gone by and my phone is still working fine and battery lasts all day... Turning off WiFi calling fixed my battery drain without a doubt. You would think Apple tested this before the release.

Follow up: 21 Oct 2014

I updated to IOS 8.1 and hoped that reference to fixing WiFi issues might solve this problem. It has not - wifi calling enabled on my phone is still broken on the "G" protocol.