iOS 4.3 causing battery drain

sorry, i haven't noticed it right this point. i updated mine last night at 5:10 pm est and the battery was 100%. i've been on the web with 3g a bit since then and did not turn it off at all, it's now 7:50 am est and my battery is still at 96%.

Same issue here , updated to iOS 4.3 last night, 100% at 8am, and down to 20% about 10 hours later, only sent 2 sms and 10 mins online nothing else ..... Drain drain drain

I've noticed a significant battery drain in my iPhone 4 as well.

I just did a test today to confirm. All Push notifications off, location services off, killed any apps running in the background and I'm in a good signal zone. I took my iPhone off the charger at 1:00pm EST at 100% charge. It's now 3:25, I've used my phone to compose to SMS messages and the battery is at 76%.

I've tried resetting all of my settings and noticed the same drain. This is a significant problem on my phone. I've read a lot of similar reports.

I'm seeing poor battery life as well. Does the whole "clear out all the settings and install iOS 4.3 as a new phone" fix this problem?

Tim Kippen wrote:
I'm seeing poor battery life as well. Does the whole "clear out all the settings and install iOS 4.3 as a new phone" fix this problem?

That was my procedure and I'm seeing some pretty huge battery drains vs regular usage on 4.2.1. These things are a little subjective though, so I'm willing to give it a few days before the freaking out begins.

It's definitely an issue, check this out: http://discussions.apple.com/thread.jspa?messageID=13189520&#13189520

Increased battery drain has been reported after EVERY update for the last 3 1/2 years. It's 100% predicable there will be a flurry of posts about the battery life after every update. It's also 100% predicable that the people posting didn't do ANY troubleshooting steps.

The problem isn't the iOS version, but data/settings damage during the update process. It often involves push and Exchange mail accounts that need to be reinstalled.

1. Reset phone - press both home and sleep/wake buttons until the Apple logo appears.
2. Close all apps appearing in the Recent opened bar (aka "multitasking" bar)/
3. If you have Exchange accounts, delete and reinstall them.
4. Restore phone in iTunes using a backup.
5. Restore in iTunes as new, without using a backup.

And so it begins....

You'd think you wouldn't have to wipe your phone for every update. I had my phone completely drain itself last night from a full charge, to 6 hours later to dead. I hadnt picked up the phone at all since I was sleeping. That's not just imagining things.

I killed apps, I reset the phone, I deleted and reset up all of my exchange accounts. I hope it works.

Oh god here we go with the battery drain threads. Mine is just the same as it was under 4.2.1 and dropping only 7% means you had an app running that was more than likely your culprit and not 4.3.

richardc1983 wrote:
Well I think that apple need to resolve this asap. Its coming up on a lot of forums.

I have even deleted and added my email accounts again but the same again! 😟

It comes up every time there is an update and like modular said the folks that are whining about it never troubleshoot before complaining here.

Doing the Home|On|Apple reset and Exchange Account Delete and recycle appears to have fixed it for me. I think I remember having to do this last time as well.

I appreciate the help. I do think that people's expectations of a trouble-free upgrade are reasonable in that most Apple stuff just works.