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iOS 8.1.2 Battery Life
- Thread starter doublex14
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I did full clean install to 8.1.2 earlier today still mail and settings show high battery usage. Never Never had a serious battery drain till that update this week. Going back to 8.1.1 now will report back later. 6+ user here
Glad I found this thread. I am having worse battery life with my iPhone 6 running 8.1.2 than ever before! 
With 8.1.1 even with moderate to heavy usage, my battery lasted to where I'd still have 60% or so at the end of an 11.5hr workday. Now...I have to put it on a charger two hours before I leave work, since it's down to 3-4%!!
How can I go back to 8.1.1?
With 8.1.1 even with moderate to heavy usage, my battery lasted to where I'd still have 60% or so at the end of an 11.5hr workday. Now...I have to put it on a charger two hours before I leave work, since it's down to 3-4%!!
How can I go back to 8.1.1?
So my battery died VERY QUCKLY on my 6 plus after updating to 8.1.2 the other day. After a full dead to 100% charge cycle it's all back to normal. I'm so glad because the battery life in this phone is what I love most about it.
Sometimes after an update I get massive battery drain and I have to disable location services and tweak a few other settings that get put back to their default. Then I turn the phone or iPad off and back on, then let it drain to about 20% or so and put it on the charger overnight and that tends to work for me.
If you use iCloud backup then all settings are restored. I'm back on 8.1.1 now and instantly my battery life is excellent again.
Either way, your settings will remain untouched if you use a backup.
It's funny how I did an OTA update of 8.1.2 and instantly noticed worse battery drain. I did five or six full charge cycles and nothing had improved, so I did a clean install of 8.1.2 and still had worse battery life. I then downgraded to 8.1.1 and did an iCloud backup. My battery life is now excellent again. The problem was 8.1.2, nothing else. I have a 6+ and am not sure if other devices are affected by 8.1.2 the same way mine was.
I'm pretty sure that some people don't keep a close eye on their battery life and would only notice battery drainage if it was massive. My 6+ was a couple of hours down with 8.1.2 on what I get with 8.1.1, but some people bizarrely wouldn't notice that or would put it down to some BS factor like 'using their phone more' etc. I have Spotlight indexing switched off and always check that my settings are the same after an update. As my usage patterns are similar every single day, I can spot even mild battery drain (compared to the previous install) pretty much instantly.
I guess I should clarify; the point releases don't reset anything for me, but it seems certain settings get reset on major updates like going from iOS 6 to 7 and from 7 to 8 it seems.
Ah, it's bliss to be back on 8.1.1��
I was getting exactly an hour for the first 10% on 8.1.2 (doing the same things).
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I was getting exactly an hour for the first 10% on 8.1.2 (doing the same things).
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View attachment 519546figured out my problem. Apple pay was literally cutting my battery in half on 8.1.2. After doing a clean install without apple pay my battery life if looks great again. I have all options from a clean install on except Apple pay and blue tooth. Should be back to 6-8 hours usage time again with my iPhone 6.
Interesting. How do you know it was ApplePay and not just the clean install that solved it? Wonder how/why that would cause drain? Looks like a lot of folks are complaining about 8.1.2 and battery issues on all devices.
Bogus and misleading. Phone plugged in since last charge. Where is the 7% you are mentioning? Please don't mislead folks here trying to get valid information regarding battery life.
More than 9 hrs on an iPhone 5s? Quite hard to believe.....
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Btw, I can't see any specific correlation between iOS 8.1.2 and an excessive battery drain. I generally noticed an higher power consumption on my iPhone 5S since iOS 8 installation, but I don't know if is caused by the new os or it's the battery that is aging....
Are you now using 8.1.2 or did you go back to 8.1.1? I went back to 8.1.1 and it appears my battery is better but not quite as good as before I first went to 8.1.2. When I did the 8.1.2 update I didn't put my credit cards back on Apple Pay or use it at all and I still had horrible battery on 8.1.2. How do you do a clean install without Apple Pay?
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Hopefully the last question because I'm sure we're all getting tired of this! Are you getting these results now on 8.1.2 without ApplePay or are you back on 8.1.1? Thanks
iOS 8.1.2 Battery Life
People are questioning this comment because the battery doesn't settle. What happens is the charging electronics needs to see 100% and then 1% or so to calibrate the phone's battery meter and display. It only needs to be done ONCE, not several times. If it is not done, meaning calibrate, the phone uses that calibrate meter to shut off too early .
According to Apple, Dell, and others this calibration could be once a month at the most or less if not needed. Doing it more often, only kills ( reduces the useable hours) the battery since Li-Ion batteries have a finite full drain capacity cycles, but a lot more partial drain capacity cycles. I rarely calibrate less than a few months, but I also recharge every night, regardless of the battery meter.
It's a far better practice to recharge at 50% than waiting until 10%....unless you want to do a recalibration.
Another thing: resetting or hard reset after an update is unnecessary. Apple does this as part of every update. Your phone completely shut down and reboots during updates. You can see it and you know it since you must enter a password since the Touch ID does not work after a reboot.
Now if you have an errand App for some other reason, then a reboot will kill it. That is a different story.
But these myth antics that people do after an update are just that. If you thought it really helps, wouldn't you think Apple would make it an auto part of the update process? Well in fact they did.
a long time ago.
Just my input. All these full drains, multiple times, is just shorting the usable charge capacity of people's battery.
People are questioning this comment because the battery doesn't settle. What happens is the charging electronics needs to see 100% and then 1% or so to calibrate the phone's battery meter and display. It only needs to be done ONCE, not several times. If it is not done, meaning calibrate, the phone uses that calibrate meter to shut off too early .
According to Apple, Dell, and others this calibration could be once a month at the most or less if not needed. Doing it more often, only kills ( reduces the useable hours) the battery since Li-Ion batteries have a finite full drain capacity cycles, but a lot more partial drain capacity cycles. I rarely calibrate less than a few months, but I also recharge every night, regardless of the battery meter.
It's a far better practice to recharge at 50% than waiting until 10%....unless you want to do a recalibration.
Another thing: resetting or hard reset after an update is unnecessary. Apple does this as part of every update. Your phone completely shut down and reboots during updates. You can see it and you know it since you must enter a password since the Touch ID does not work after a reboot.
Now if you have an errand App for some other reason, then a reboot will kill it. That is a different story.
But these myth antics that people do after an update are just that. If you thought it really helps, wouldn't you think Apple would make it an auto part of the update process? Well in fact they did.
a long time ago. Just my input. All these full drains, multiple times, is just shorting the usable charge capacity of people's battery.
Here's what I have so far back on 8.1.2 To early to tell. I installed it back on and didn't use ApplePay. I'm not sure how to install it without ApplePay unless you mean to just not utilize it.
