iOS 5.1 Batterydrain issue/problem

So far - 100% charge up at 5.1 install.

90% battery after:

36min usage

7hours 57min standby

Since last full charge.

I have the same feeling. IOS 5.1is a failure to me. Before upgrading to it , I used 5.0.1 and it usually drained 3% of battery standby over night with fully charged before the night. But now I upgraded to 5.1. I standby for whole night without touching it as usual, it drains 4% of battery. This is not a big deal. But the weird thing is that the usage shows that I have been using it for more than 1hour. I wonder when I have used it for so long time. Before sleeping. I just used about ten minutes. Who used my phone for an additional hour? And now I'm using it. It drains battery faster than before.

I'm glad to see someone else posting this. I've had no problems with my 4s until this morning when I did the new upgrade. In less than 5 hours at work, I went from 80% to 15% and that was just a little web use on Wi-Fi. I always keep bluetooth off and most location services turned off as well. If this was considered a "fix" someone needs their head examined.

I also saw something weird as heck too - a 4g sign up where the wireless indicator is at...

Yes! For me it's worse now than it was before the 5.1 upgrade.

Time to shut off a few notifications, I quess.

Mail is on manual, and I'm not running iCloud updating.

Go figure!

You are sort of right in one direction. But in the other hand we feel that the battery is going at random, meaning that at one time it goes fast, and at others, it goes slow. I'm expiriencing these problems my self.

You know, in that case, Blue Shooter,maybe the battery is draining so quickly, because the charging cycle is off kilter.

Maybe the battery has not been completely drained for calibration, or the charging cycle has been interrupted.

There's something about it in the manual, I read a while back, and I did have to plug in to down load the update, and then I interrupted that charge.

So if that's the case, the battery problem should clear up after a few charging cycles!

Thanks for the idea! Let's hope it's that simple!

Gotta go charge up soon. I'm down to 5%.

ios 5.1 4S

Battery: 74%

Usage: 1hour 12 Minutes

Standby: 23hours 12 minutes

Yeah i have the same problem

since i updated it to IOS 5.1 i thought it's going to be better but no difference

battery still drain even i didn't do anything

i think even worse because they added more feature

IP4 IOS 5.1

Battery @ 99%

Usage 31 mins

Standby 8hrs 7mins

One thing I have noticed is that CPU usage can be quite high following a reboot, especially after an iOS update. I have seen elevated CPU usage for something like 1 or 2 hours. This happens on every iOS update I've performed since iOS 3.x. I can only guess that iOS performs a bunch of post-update cleanup and setup.

You can look at CPU usage by downloading any one of several monitoring apps. Though most of the apps will list running processes, they, unfortunately, will not list CPU usage for each process. Still, knowing what the overall CPU usage is can be helpful in finding the culprit app or feature through trial and error.

Anyway, before anyone declares iOS 5.1 a failure with regard to battery drain, give the phone at least a couple of hours to settle down before doing any measurements. Better yet, keep the phone plugged in during this time.

idk But i feel like mine actually got better

3 hours, 33 minutes of usage

9 hours, 54 minutes of standby

and im at 56%

but not as good as my brothers his lasts way longer then mine

his is

7 hours, 45 minutes of use

and 1 day, 3 hours of standby

and his phone was at 35%

Yes. Same for me but I have:

3hrs, 28mins

With 28%

That's how my phone use I be till I updated to iOS 5.1

But it also depends how much signal you have and if you have 3G

The first time I updated to ios 5.1 my battery was horrible it didn't even last me a full day I don't think half a day

When I first updated it lasted me

1 hour of usage

And

5 hour ion standby

And it died

And I had my phone fully charged when I woke up

But now since I restored it it's gotten better

What difference does it do when you restore it?

I honestly don't know I was just told to restore it when I called apple and it worked

But they told me not to restore from a previous back up so if you do restore it you have to start knew