iPhone 4 iOS 5.1 Battery Drain ... Major progress for me

Confirm what? I have no problems with battery drain.

I'm trying it now and will let you know how tomrrow goes!

I have the same issue, suddenly since 2 days ago the battery is draining really fast and the phone is getting super hot. I've tried everything under the book, including the restore, the switiching off notis, push, EVERYTHING, and nothing seems to be working. Is there a way to remove the update? And could that cause further issues? Any help is appreciated!

@Shaggy1966

I tried your solution. Just wanted to let you know that it didn't work for me but I really appreciate helpful posts like yours to try to address it.

Recapping the problem I had: I had phenomenal battery life and standby time in iOS 5.0.1.

After upgrading to 5.1, the battery life plummets by more than half. I am looking for all possible solutions and tried yours. The net-net for me is that I'm using my phone EXACTLY THE SAME WAY after the iOS 5.1 update as I did before and my battery life and phone functionality has plummeted. It's just like when the 4.1 update came out and killed my iphone 3G.

Other things wrong after the 5.1 update: can't use data functions and talk on the phone at the same time easily. Text messages spin constantly and never send if an image is attached.

Tons of suggestions say to "turn off this" and "don't do that" but that hasn't helped either. Even charging is a problem. Thanks for the help... but I will keep looking or ask a Genius to roll me back.

@gdgmacguy no need to respond here. I've read your recent posts and responses on the matter as well.

No two devices are the same. What works for you, may not work for soemone else. There are general things that can preserve battery life, which you have already pointed out.

I'm using Exchange but I was before. Before I had 3 days of standby with Exchange running. I could charge every other day. Just this morning I'm down to 38% in 2.58 hours. Yikes!

I had almost the same problem. My batterie drained after 4-5 hours. I removed my Exchange account, and the battery lifetime as amazing. I reseted the network settings, and then reattached my Exchange account. The battery lifetime is still good! So try to reset the network settings and then attatch your email account again, and see what happends.

I never had an Exchange account. So far I've restored three times, keep WiFi off mostly, have turned off the "push" for every app, reset the network settings and updated to iOS 5.1.1. Also got battery manager, nothing seems to be working 😟

I am on 5.1.1 I have been having batteriey issues for the last few weeks and I just updated to 5.1.1 yesterday. But today it seems even worse. I had a full charge at 11 and its at 35% at 4 and I haven't really used it at all...

I was also having a problem where my emails were not either marking as read or deleting. I would read an email or even delete it and lock my phone only to return a while later to see that they emails were still there marked as unread. This happened for the first time yesterday. The night before I went to sleep with the app MyPhone+ syncing my facebook contacts to my phone contacts. I woke up and somehow I unplugged the phone and it was dead. I charged it up to fine these issues happening. Updated to 5.1.1 and the battery is even worse than it was two days ago...

I just deleted my exchange accounts and we will see what happens... Will update later.

UPDATE: So I tried deleting my Exchange mail (but I didn't change my iCloud account) and reset my networks and still same old thing... I charged it for a little and had to run out of the house. The charge was at 57% maybe 10 minutes ago and I took a call for 3 minutes and now I am at 47% and I still cannot delete emails without them showing up again in 20 seconds as a new unread email... Plus my email screen is saying Connecting... at the bottom ALL THE TIME!!!

I'd like to add that I'm suffering the same issues since upgrading to 5.1.1. I use Hotmail, and whether it's configured as a "hotmail" account or set-up via Exchange the battery life is now horrendous. As soon as I remove the account everything returns to normal.

I've never had any issues like this before 5.1.1

I've tried resetting the phone, adding/removing the account, etc - nothing resolves the issue - apart from removing the account and not adding it back!

Have you edited the Sync settings for that account? It could be constantly fetching, where your other accounts do not.

I've gone through a process of elimination with the Hotmail account. Started with only Mail activated, Contacts, Calendars, Reminders switched off. All was ok.

I then went thro and activated the remainder to see when the battery started to drain quickly.

I've discovered the problem occurs when Hotmail Contacts are activated. Phone heats up, and battery drains quickly. If I turn Hotmail Contacts off the problem goes away.

I've no idea why this would be the case as my Contacts are pretty static and this was never a problem before the 5.1.1 update was applied.