iPhone 4 - ios 4.3 - Battery Drain

I also had this problem recently and turned out it was my push email which is the culprit. Thank god I did not have to go through the hassle of a DFU reset. This link provides step by step diagnosis which helped me.

http://zen-arch.blogspot.com/2011/05/why-is-my-iphone-getting-insanely-hot.html

Still monitoring my phone now, hope the problem is permanently gone.

Guys - I´ve had this issue and solved it.

First off: Install a system monitor from app store - the reason your phone is draining is because the cpu is going "mental" - running on 100% because of an app error. (I installed Activity Monitor from HandyPadSoft - works fine.)

So - in this app - check to see what apps are *actually* running - the sys tray might be lying... Deinstall the apps you suspect are the culprits - shutting them down is not enough. Then restart your phone holding both buttons for 10 secs to really wipe the memory.

In my case, the issue was mail syncronizing with exchange, and I suspect also that MyPhone+ (Facebook sync tool) had something to do with it. So I deleted my account, restarted the phone, and added it again. My CPU load went from 100% to 15% average...

Why - I dunno... 🙂

this solved the issue for me - on my iphone 4 and on my girlfriend's iphone 3GS. probably in most cases it is enough deleting the mail accounts on the iphone and doing a proper restart and install the mail accounts again. therefore, maybe you can save the money for the Activity Monitor app (however, it's impressive to see the cpu "idle" utilisation drop from about 50% to 5% after deleting the mail accounts).

battery drain problem solved! thanks baardb!

No, you are all ignorant of multitasking or your battery is dead. If you were not draining the battery all the way down every time or you were pushing email then you already killed the cycles of the battery.

At last, after trying loads of things, I have now got my battery life back to pre OIS 4.3 levels. Yesterday after 8 hours it was at 27% without even using the phone and all apps closed. Today with excatly the same use (or lack of it) I am still at 97%.

Just deleted all my mail accounts and restarted the phone and setup my mail accounts again and that seems to be it all sorted. Thanks to "baardb" and "pluuuto" for their helpful posts.

I too have had this issue since 4.3x. None of the "solutions" have worked. The phone still drains 5-10% on standby.

The ONLY thing that can prevent this is to turn location services (gps) to *off*. Whatever is causing the drain is using gps, even if there is no gps indicator on the screen. Turning gps off eliminates the standby drain.

went to bed at 92% are 10pm, woke up at 8 at 16% somethings wrong. any ideas?

Solved!

Turns out, it wasn't an issue with 4.3x at all. At least not for me. I was confused as to why turning off location services would make the standby drain go away. On a hunch, I charged the battery to full last night and turned off gps. This morning, the battery was at 98% and usage showed 8 hours on standby and 4 minutes of usage. Sounds right.

I charged it to full again to reset the usage stats, then turned on gps. A couple of hours later, the battery was at 80%!. Usage showed 1 hr 52 mins on standby, 1 hour and 23 mins of usage. The iPhone was off the entire time. Huh? Something is running in the bg, but I didn't see any processes running and I had cleaned out all background apps.

Then it dawned on me - Find my iPhone!

As we know, Find my iPhone is used via a web or iPhone app. I found it a bit frustrating at times because it only tracks the phone for a minute or so, then logs you off after a couple of minutes. I looked for a front end Mac client that could use the Find my iPhone functionality and keep the tracking live. I found one from Sosume. It worked great! No more logging in, and it tracked in real time. It worked so good I just kept in running minimized.

Kinda dumb huh? So my Mac was forcing all the iPhones on my MobileMe account in a constant gps mode. Major battery drain, even in standby. I simple exited the Sosume app. and the I4's battery is back to epic capacity.

So... when Find my iPhone logs you out... it does so for a very good reason.

Iphone4 here with 4.3.3 and restored by phone from my 3GS backup, then noted that my battery drain was pretty extreme - barely capable of holding a charge for 1 day and losing 30-40% overnite on standby.....

Finally deleted my Gmail account (which wasn't even enabled for fetch), rebooted by shutting down normally and restarting, then adding back gmail. WORKS NOW!

Thanks to all for the tip.

iPhone4 on 4.3.3.

Problem was caused by my gmail account which was using Exchange. I changed the password and updated the actual gmail account but forgot to update the Exchange account.

As soon as I updated the password, CPU usage went from 80-90% down to about 10%

Phew!

Helped me too thanks guys

WARNING! WARNING! WARNING!

If you have battery drain issues, it's highly possible that your iPhone is sucking up your bandwidth!

A few days ago I started having same problems as everyone else here. The battery drain was horrible and I would get maximum of 5 hours on a full charge, with pretty much everything turned off except data network. So, today I had enough of it, and decided to figure out what was causing the problem. For me, the trick was to disable Ping, log out of Apple store, turn off all mail accounts, reboot and turn the mail accounts back on. After this, my battery usage was back to normal.

In the process of pinpoiting the problem, I also checked my bandwitdh usage with my provider, and to my surprise I found out that in 5 days I've sucked up over 1 GB of data! Normally, I spend around 700 mb PER MONTH, so this was way over the top, especially since my iPhone is on cellular data network maybe 8 hours a day (when I'm at work). The rest of the day it's hooked to my home WiFi. Luckily I have unlimited data plan so it's not going to cost me anything, but I assume that some people might have serious problems at the end of the month when the bill arrives.

So, to everyone out there - check your network data usage with your provider!

I got it resolved. I'm running an iPhone 4 and after the upgrade to 4.3.3 OS, I also experienced a terrible drain on the battery. I recharge every night and would leave the house a 9 am and the battery level would be under 20% by late afternoon. That's with relatively light usage.

Anyhow, I tried several things before I found a solution that worked for me. I downloaded a program called 'Monitor' by HandyPadSoft and discovered the 'Mail' app continued to run even though I had terminated every program on the phone. I ended up uninstalling several mail accounts including Exchange, Mobile Me, Gmail, and a couple IMAP accounts. I did a reset and then recreated my mail accounts. I did 2 more resets and then recharged the phone for 30 minutes or so. The odd thing is the Monitor app still shows the Mail app running. Nevertheless, I've had the phone on for a couple hours and it's still showing 100%. I think I'm cured. At least I hope so.

Best,

BJD

The Mail app runs all the time. That is not the problem. The problem is that sometimes the Mail app gets stuck trying to use a stale Push connection. The usual fix (which has been posted hundreds of times, including in this very thread, and could be found with Search) is to turn off any Push accounts, open mail, then contacts, then calendar to flush the queues, Reboot the phone, and turn the account back on.

I never had push enabled. Not now, not then.