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iOS 5.1 Battery

Marcus PM said:
Seamlessly updated my OS last night. After several hours use this morning, battery drain is about half of normal for my 4S. Will need a few days use to know for sure.
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Ditto-- exact same experience here. But, as noted earlier in the thread, Bluetooth seems to have been turned on by this update. If you're not using it, turn it off.
 
Battery life for me is still pretty bad on my 4S running 5.1

Should I do a clean install? if so, how do I go about doing this?
 
My 4S has seen a SIGNIFICANT boost in battery. Thursday is one of my heaviest usage days and came back with 70% when I normally would come back with -20%. The usage is reporting normally now instead of the same time as standby. Thanks :apple:
 
vassillios said:
My battery life was great until this upgrade. After 3 hrs of almost no usage, I've dropped from 100% to 61%
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Try doing a hard reset of the device. Mine was draining quickly after the upgrade and then I did a hard reset and charged to 100%. Battery has been great ever since.
 
Much better. I did a clean restore. I'm only down to 90% after taking the phone off the charger at 7am. It's now 12:30. Prior to 5.1, I would be down to 75% after similar usage.
 
Best way to go about restoring?

Some people here have mentioned doing a complete clean restore/reset... I'm just a little nervous about doing this. What's the best way to do it and preserve all of my contacts (including the ones that are only in my iPhone and not in my address book on computer) and messages? Also - does doing a clean restore and re-installing apps require going to the App store and manually finding all your own apps and re-installing them?

Just sounds like if you're doing a "clean" restore, you're not restoring from one of your backups, so need to manually redo everything... am I misunderstanding?

My battery life does not seem to be improving so I wanted to give this a shot. If someone who uses this method could post a rough step by step of how they execute, that'd be awesome!

Thanks!
 
MotionxxUSxx said:
Much better. I did a clean restore. I'm only down to 90% after taking the phone off the charger at 7am. It's now 12:30. Prior to 5.1, I would be down to 75% after similar usage.
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is it better to do the clean restore (as new phone) ?

I used the OTA upgrade to 5.1 and I found it a lot better than when I bought it with the 5.01..

Usually with the 5.01 after I charged it until 100% and open my twitter acount for 5-10 minutes the battery stats already showing 95-96%, but now it stay in 99-100%.. I'm happy with the improvement... :)

If I do a clean restore, will it be better or the same.. sorry if this off topic..
 
Seems to be improved

I would say that my battery life on my 4S has improved by about 25%. Also take into account with this screenshot that I have my mail fetched every 15 minutes, which is supposed to drain the battery quite a bit.
 

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YEAAAA!!!! Got back from work. Ever since i got the 4S i always had around 20 to 23% left on the battery. now with the same usage and time its at 52%

thank god it worked for me. even though as i mentioned in another thread. 3G seems to be turning back on on its self even though i disable it
 
Hi guys, I have a doubt, since 5.0 to my 5.1, I've noticed that for each ~ 10 minutes from standby time measure, 2 minutes of usage time measure is added, even if I don't use my device, I have an iPhone 4, anyone noticed the same? I've tried clean restore in 5.0, 5.0.1 but not 5.1 yet, maybe this problem is related with my backup file? when i had iphone 3g i went to sleep with 100% battery and woke up with 99%, now i'll sleep with 100% and woke up with 95, 94 % and no, i'm not sleeping more ;p

thanks!
 
5.1 battery life seems the same to me...but I didn't have real problems before. However, this time I do have the time zone feature on.

will need more days to really figure this out.
 
spscott said:
Some people here have mentioned doing a complete clean restore/reset... I'm just a little nervous about doing this. What's the best way to do it and preserve all of my contacts (including the ones that are only in my iPhone and not in my address book on computer) and messages? Also - does doing a clean restore and re-installing apps require going to the App store and manually finding all your own apps and re-installing them?

Just sounds like if you're doing a "clean" restore, you're not restoring from one of your backups, so need to manually redo everything... am I misunderstanding?

My battery life does not seem to be improving so I wanted to give this a shot. If someone who uses this method could post a rough step by step of how they execute, that'd be awesome!

Thanks!
Click to expand...

^^^ What this guy said please, im new to iPhones! ^^^
 
I always do my upgrades from backups and it works fine. Only with 5.0.1 did I have to do some 'special' things, but 5.1 was done from a backup and went just fine.
 
since upgrading (18 hours ago), the battery on my 4 has been completely drained three times! the iPhone is also significantly warmer.

I feel as though one of my applications is not happy with the update.

also, the Phone application crashes.

Everything was working normally before the update.
 
I really hope this isn't just a glitch. :eek:

I've been texting and using Facebook on and off since I've unplugged it. :D Normally It'd be at 97% after 30 mins.

EDIT: It hit the 99% mark after exactly 31 minutes of usage.
 

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Instead of speculating what is causing battery drain, has anyone looked at your iPhone's log that actually reports usage by application? The log is called "log-aggrigated-[date].log". You can find it on your phone under Settings --> About --> Diagnostic and Usage --> Diagnostic and Usage Data

The keys of interest are:

appBackgroundActiveTime
appActiveTime
com.apple.power.wake_reasons

Post the largest values
 
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