Sudden Battery drain, not iOS 9.2, solved

Question

Sudden Battery drain, not iOS 9.2, solved

A few days ago my battery suddenly started draining fast. Classic symptom: In Settings/Battery Standby Time was equal to Usage. (see: http://appinstructor.com/blog/2014/the-ultimate-guide-to-solving-ios-battery-dra in). It was not caused by 9.2, because it was almost a week after installing 9.2. Here is the troubleshooting procedure I followed:

Reset by holding HOME and SLEEP until an Apple logo appeared - not solved
Killed all apps after double-pressing the HOME button, then reset as above - not solved
Turned off Push email - not solved
Checked Settings/Battery; the top app was Calendar, at 78% of battery usage - this narrowed the search
Knowing that sometimes an MS Exchange account can cause heavy battery drain, I deleted my Exchange account and reset - not solved
Additional clue: In OS X Activity Monitor on my Mac the Calendar app was using huge amounts of data transfers - over 1 GB
The only other source of Calendar events was iCloud, so I turned off iCloud Calendar and reset again - Battery drain stopped
Added my Exchange account back - No additional battery drain
So the problem was related to iCloud contacts. On a hunch I left iCloud Calendar off overnight. When I turned it on again the battery drain did not return - problem solved.
The heavy data usage in Mac OS X stopped when I turned off iCloud Calendar.

While I can't explain why this worked, I can speculate that there was data corruption in the calendar database, that somehow was fixed by leaving it off for a period of time.

iPhone 6, iOS 9.2, 128 GB

Posted on Dec 23, 2015 2:49 PM

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Answer 1

Dec 24, 2015 8:23 AM in response to Lawrence Finch

Thanks Lawrence added this to my Favorites.

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Answer 2

Dec 24, 2015 8:25 AM in response to razmee209

I suspect many users would think this was an iOS 9.2 problem, because it happened after installing iOS 9.2. Post hoc, ergo propter hoc is not a good philosophy 😉

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Answer 3

Dec 26, 2015 1:36 AM in response to Lawrence Finch

"I suspect many users would think this was an iOS 9.2 problem, because it happened after installing iOS 9.2"

If no other changes have been made, no other software installed then it's absolutely logical to infer B comes after A.

I have never had battery problems before during any iOS update/upgrade. But *like many here* I suddenly have abysmal battery life.

I couldn't care less whether it's an ical problem or a dodgy app or whatever - I SIMPLY DON'T CARE. All I want is my phone to be usable again.

I now have a phone that will not last a full day - OF NOT BEING USED.

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Answer 4

Jan 16, 2016 7:58 PM in response to Lawrence Finch

YYeah when I play line play on my iPad mini for 3 hrs it wasted 25%-37% of battery- wowwwwwwwwww

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Answer 5

Jan 17, 2016 10:39 AM in response to JasonKiddy

JasonKiddy wrote:

"I suspect many users would think this was an iOS 9.2 problem, because it happened after installing iOS 9.2"

If no other changes have been made, no other software installed then it's absolutely logical to infer B comes after A.

You really need to look up the meaning of " Post hoc, ergo propter hoc fallacy".

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Answer 6

Rafiqt

Level 1

0 points

Jan 17, 2016 10:45 AM in response to Lawrence Finch

My phone died 2 minutes after use and it was 99 charge. My problem is not battery drain, it is just shutting down randomly. IT didnt happen until after

9.2 update.

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Answer 7

Jan 22, 2016 4:40 AM in response to Lawrence Finch

apparently managed to solve, I did the following:

1 - 6 connected the iPhone to your computer via iTunes

2 - I clicked backup the computer and iCloud (both)

3 - disconnected

Did just that this 8% of barteria used (17min Use / 54min wait)

It is still not ideal, but better than it was.

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Answer 8

n3ntj

Level 1

0 points

Feb 16, 2016 6:40 AM in response to Rafiqt

I am using an 6s running the latest iOS and I also repeatedly have battery drainage issues. I'll have all apps closed and the phone is in Airplane mode overnight, yet I see sometimes 5% battery loss overnight. I have iCloud turned off. The other issues noted above appear to not solve the issue either. I was flying my drone the other day and the battery was down to about 10% and then the phone just shut down for no reason. Luckily, I can fly my drone without my phone. 2 days ago, my phone was at about 20% and then I looked a few minutes later and it was at 3% for no reason (no wifi, no bluetooth, etc.) was on. What is up with these repeated battery issues with iPhone 6s?

iPhone 6s, 16 GB, iOS 9.2.1.

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