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iOS 8 draining battery extremly fast.

My battery was draining like mad after iOS 8. I think I found the solution. Went to mail contacts and calendars and found my exchange account which I use for work. In there I disabled the calendar and then re-enabled it after a few seconds. Problem gone.

Hints were that calendar was the app burning the most battery and iCloud calendars weren't the culprit. Also had the same issue after upgrading to iOS 7.

Hope this helps someone!
 
reggoboy said:
My battery was draining like mad after iOS 8. I think I found the solution. Went to mail contacts and calendars and found my exchange account which I use for work. In there I disabled the calendar and then re-enabled it after a few seconds. Problem gone.

Hints were that calendar was the app burning the most battery and iCloud calendars weren't the culprit. Also had the same issue after upgrading to iOS 7.

Hope this helps someone!
Click to expand...

I think you've found my problem, reggoboy.

I dropped from 100% to 65% battery in about 2 hours this morning. (iPhone 5, just upgraded to iOS 8) Primary culprits in Battery Usage screen was Home & Lock Screen, Calendar (background activity), Contacts (background activity).

I think there's a bug in how these guys are syncing with the Exchange server, must be getting stuck in a high-CPU loop. The phone was warm, too, indicating that it was working hard.

I've disabled the contacts and calendar from my Exchange work email account, and it seems like the drain has slowed. We'll see if I have to charge the phone before the end of the day, but at least it's not hot anymore.
 
grockk said:
Need to do a reset network settings, or reset all settings. Something is active all the time and not letting your phone go into idle.
Click to expand...

That fixed the standby/usage issue but it still won't populate apps by usage. Just keeps saying they'll be available in a few minutes. Any resolution to that issue?
 
Mine says Mail and Lock screen are using the most battery. Did all the reset network and disableing everything to no avail. battery is draining like a leaky faucet.

This sucks!
 
flyinmac said:
iPhone 5 w/ 16 GB... Battery usage seems fine,

10 hours 23 minutes on "Standby" with the phone checking e-mail over cellular and wifi almost equal time.

And, 2 hours of usage browsing internet, answering e-mails, texting, taking pictures, talking on the phone, looking up recipes while cooking, etc.

And, has 85% battery left. Just did the update this morning through iTunes and went right about normal day with it. No problems, no complaints.
Click to expand...

I'm sorry but this battery life seems WAY too good. I'd probably be at 30% with that usage and I'm on a 5s, which should have BETTER battery life than a 5.

EDIT: Here's a screenshot from iOS 7.1.2, iPhone 5s. Just light safari browsing, some twitter and snapchat, sent 1 text message. This is my battery life, and this is after a fresh restore (I restored my SMS with iBackupbot however).

EDIT 2: 4 minutes later and I drop 2%. Wonderful! Dropped to 82% 2 minutes later. Unacceptable.
 

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Location Services

Im on a motorcycle trip. With the iPhone 5 charging, all apps shut off, and in airplane mode, the phone was still draining (losing a percent about every 2 minutes). I shut off all location services and that stopped the drain. What was so surprising was that even in airplane mode, and with apps off (double-click home button and individually swipe up) apps were still running location services in the background.
 
iPhone 5s, 16Gb, Space Grey.

Restored to iOS:8 as a fresh install on the 18th.

Not really an objective report on battery life for me, but subjectively I've found iOS:8 isn't near as good as iOS:7 was.

My iPhone spends the day within WiFi for 85% of the time, come 9pm I'm finding the iPhone is in the red (I don't have the % turned on) where as with iOS:7 I'd never get that low.

Maybe Apple altered the colour change.. I dunno.
 
In my case of battery drainage I noticed that my cpu was working at between 50 and 90% when idle. It resolves itself for a while when I put it in airplane mode for a few seconds. When I switch off airplane mode the phone returns to less than 10% cup usage when idle. However, after a while, it will return to very high cpu usage. So in my case it is definately something to do with either cellular or wifi.

Edit: actually after further investigation, it is definately the mail app which is causing the cpu to go haywire, as once I deleted all my email accounts except iCloud, phone returned to normal and stayed that way.
 
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watchthisspace said:
Maybe Apple altered the colour change.. I dunno.
Click to expand...

Nope. Red is still 20% and below on the iPhone.


Have people tried turning off Frequent Locations if you don't use it?
Settings- Privacy- location services- system services- Frequent Locations- turn it off.
See how you go. Made a bit of a difference for me on my iPhone 6.
 
This "update" turned my fully functional, useful iPhone 5 into a very expensive paperweight whose battery literally (and I do mean literally) drains from 100% to 30% in 30 minutes (that's a loss of 2% battery life PER MINUTE) and this was with no apps running, no wifi, and no location services in sleep mode (with the screen off). I called applecare to be informed that after rebooting, resetting, and reinstalling (the apple 3 r's) that I could have the privilege of paying $80 to have my phone repaired (apparently the 4th r) but I emphasize, there was NOTHING WRONG with it before the IOS 8 update. If you haven't already fallen victim to this "update" and you have an Iphone 5 or earlier, I would advise against the update until they debug it because my iPhone has basically been downgraded to a wall phone as it has to be plugged in almost constantly to function anymore.
Here is like to my video on YouTube of the battery on my phone draining 10% in 4 minutes. https://www.youtube.com/watch?v=ZyMJ82_fuUQ
 

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fedupwithapple said:
This "update" turned my fully functional, useful iPhone 5 into a very expensive paperweight whose battery literally (and I do mean literally) drains from 100% to 30% in 30 minutes (that's a loss of 2% battery life PER MINUTE) and this was with no apps running, no wifi, and no location services in sleep mode (with the screen off). I called applecare to be informed that after rebooting, resetting, and reinstalling (the apple 3 r's) that I could have the privilege of paying $80 to have my phone repaired (apparently the 4th r) but I emphasize, there was NOTHING WRONG with it before the IOS 8 update. If you haven't already fallen victim to this "update" and you have an Iphone 5 or earlier, I would advise against the update until they debug it because my iPhone has basically been downgraded to a wall phone as it has to be plugged in almost constantly to function anymore.
Click to expand...
If it was solely due to the iOS 8 upgrade, it would seem that everybody with an iPhone 5 or earlier should be experiencing the same problem.

I'm using an iPhone 5 - fully charged it last night before bed, unplugged it from the charger and set it on my nightstand (wi-fi connected, no apps running). It still showed 100% when I woke up this morning. Since then, I've used it very lightly on wi-fi throughout the day (downloaded and played with a couple apps, looked at Facebook a couple times, checked e-mail, etc.) and I'm still showing 94% battery at almost 4:00 pm. Running iOS 8.0.2 (upgraded via iTunes).

Not saying that you aren't experiencing problems with your phone, but if it was a bug in the OS, it should effect every iPhone 5 in the same way, since they're running identical hardware.
 
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fedupwithapple said:
This "update" turned my fully functional, useful iPhone 5 into a very expensive paperweight whose battery literally (and I do mean literally) drains from 100% to 30% in 30 minutes (that's a loss of 2% battery life PER MINUTE) and this was with no apps running, no wifi, and no location services in sleep mode (with the screen off). I called applecare to be informed that after rebooting, resetting, and reinstalling (the apple 3 r's) that I could have the privilege of paying $80 to have my phone repaired (apparently the 4th r) but I emphasize, there was NOTHING WRONG with it before the IOS 8 update. If you haven't already fallen victim to this "update" and you have an Iphone 5 or earlier, I would advise against the update until they debug it because my iPhone has basically been downgraded to a wall phone as it has to be plugged in almost constantly to function anymore.
Here is like to my video on YouTube of the battery on my phone draining 10% in 4 minutes. https://www.youtube.com/watch?v=ZyMJ82_fuUQ
Click to expand...

Do you happen to have one of the iPhone 5's that had a defective battery (Mine was, but I just replaced it using Apple Care)?

Check here!

https://www.apple.com/ca/support/iphone5-battery/
 
Anyone else have really quick battery drain and heat while using the phone for seemingly light tasks at low brightness (just quickly checking Twitter, facebook, snapchat stories, instagram, Safari, etc) never seen more than 6 and a half hours on my iPhone 6. Restored the thing as new a week ago, barely anything is on it other than synced pictures and less than 20 apps, most are just little utilities that won't affect anything. Standby is fine though, it used to be horrendous but updates have fixed it. 100% before bed, 100% in the morning.
 
Wise87 said:
Yes I was warned but IOS 8 is seriously eating up my battery on my iPhone 5s. I did an OTA update, not a clean install. I'm not too worried because I'll be getting the iPhone 6 on Friday and I will be wiping this phone. In just a course of 30 minutes I went from 100% down to 86%. My phone pretty much lasted all day with normal usage and I would still get home with 45%.

Anyone else seeing this or suggestions.
Click to expand...

You could try a hard reset. Erase network settings. Then, a hard reset again. If that doesn't help, I would wipe it and restore fresh.
 
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