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iOS 4 Battery Life

I wiped and reinstalled the 4gm jailbroken a couple of days ago after having horrible battery life. Now, the battery life is great. In fact I'd say it's better than 3.1.2

I'd say to those having bad battery life, think about restoring again, it may help.
 
jersey said:
I wiped and reinstalled the 4gm jailbroken a couple of days ago after having horrible battery life. Now, the battery life is great. In fact I'd say it's better than 3.1.2

I'd say to those having bad battery life, think about restoring again, it may help.
Click to expand...

I did a clean reinstall on my 3GS after just restoring it to iOS 4, but the battery life is still killing me. I should just go back to 3.1.3. Ugh.
 
here is how mine look after i installed ios4. i let my phone drained til it shut off then charged it to 100%. can anyone comment if this is good?
i have setup exchange, gmail, yahoo mail, and push notification on.

btw, im on 3GS. i was at JB 3.1.2 and restored as new phone after ios4 installed.
 

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I installed/jailbroke iOS4 on my launch day 3GS via custom firmware last night. Used a backup from 3.1.2. Today I unplugged my phone at about 10:50am with full battery and the next time I checked it at about 2:00pm it was at 6%. Just sitting in my pocket. I think I should restore and set it up as a new phone huh?
 
Well the bigger battery on iPhone 4 will probably remedy the situation. It looks like the longer battery life they advertised is only possible with A4 chip. I am worried about hi-res screen though.
 
1/2 yr old 16GB 3G. Upgraded to iOS 4 and restored from backup. Absolutely atrocious battery life (reached 20% with limited use after 7-8 hours of standby). Performed a DFU restore and setup phone as new. Overall the OS feels snappier, but still experiencing poor battery life (but better than the restore from backup). Today's usage was almost all 3G browsing with a few minutes of Knocking Live video. Here's a screenshot with 13% left:
 

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Just adding my two cents. I always had very good battery performance from my jb 3.1.2 but I think my 4.0 GM is as good if not better than this. Mine has wi-fi enabled all the time, screen at it's brightest, location services on too. I charge it every night but I'd say I'd get two days usage from it as long as I don't play games for any length of time. I still use it regularly for email, web, notes and texts though. Looking forward to iPhone 4 upgrade to compare.
 
Sounds like a really mixed bag in terms of 3gs battery life. Thanks for the tips on doing a complete battery drain.
 
iOS4 is killing my battery - more specifically, WiFi does not sleep when in standby and I was losing about 5% of battery every 15 minutes with no activity. I first tried shutting down background notifications with no luck. Then when I finally turned off WiFi battery use was a little better than 3.1.3 using only 3G. Guess I better keep that unlimited 3G plan in place! 😱

BUT I notice I have fewer bars in a few locations (how can that be without any hardware changes). Oh well, that replacement 4 better be REALLY better.
 
I think I'll need to re-calibrate mine. I've been using it on and off for almost an hour and it still says 100%.
 
rwilliams said:
I went from 3.1.2 on a jailbroken iPod Touch (3rd gen) to the iOS 4 GM using the restore method. My battery life is ABSOLUTELY HORRIBLE unless I put it in airplane mode, thus shutting off the wifi. If I do that, it's fine. If I don't, the battery will completely drain in a matter of hours.
Click to expand...

Same here. I had a jailbroken 8gb mc with tons of jb junk running including multitasking (proswitcher) and home screen wallpapers from winterboard and a full charge would easily get me through the day,but now a non jb ios4 with just wifi has to be charged attest twice a day even if I power off instead of standby. I don't even listen to music on my iPod, I use my Walkman.
 
I'm draining my iPod right now to 0% and then I'm going to charge to 100% overnight. Ill post the results after im done. I had a jailbroken 8gb mc with tons of jb junk running including multitasking (proswitcher) and home screen wallpapers from winterboard and a full charge would easily get me through the day,but now a non jb ios4 with just wifi has to be charged attest twice a day even if I power off instead of standby. I don't even listen to music on my iPod, I use my Walkman.
 
holy crap

Same here. My IPhone 3G now gets 7-8 hours on standby from full charge. (Used to be days). What the hell is IOS 4 doing?????
 
iOS4 + iTouch 2G = less than 12 hours standby time!

Upgraded to iOS4 on Tuesday evening -- had 100% charge. Wednesday morning my iTouch was completely dead! Plugged into charger got back to 100% and left the iTouch on counter in sleep mode while at work. Came home and unit was dead again!

No settings were changed since 3.x. If I have to keep turning off Wi-Fi it defeats the purpose of having the iTouch in the first place at home. This is absolutely the worst OS upgrade yet. Going back to 3.x until Apple fixes this problem (if they ever admit it).

Oh yeah, tried the full backup and restore bit...did not make any difference.
 
Suspended apps = persistent wifi

I also experienced a huge drop in battery life with iOS 4 on my 3GS, and could see that wifi was always on when coming out of sleep mode.
Apple claims that you shouldn't have to worry about closing apps that are suspended, but if I manually close all, then wifi is shut down on sleep as before iOS 4. So I guess I will worry after all.
Would be nice with a "Close all suspended apps" option...
 
Hi guys, I've finally get rid of my battery consumption. In my case it was the gmail account causing the drain. Originally I configured it with the apple pre-configured gmail account (fetch mode). When I put it on manual fetch I suddenly note a lower drain. So I deleted it and reconfigured as a generic imap mail account. Now my iPhone rocks. On idle status (3g and wi-fi on, with 2 gmail accounts and mobile me fetched every 15 minutes) it uses 1% of battery every 1,5 hours with usage time of only 10 minutes!
 
first day with the iPhone 4; includes everything + Facetime for around 45 minutes
 

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So I jailbroke my 3G a couple of weeks ago and its running on 4.0 GM. Disabled 3G, run wifi and have push enabled for facebook only. And also when i jailbroke it i set it up as a New Phone.

I have M/T + wallpapers + remove recents + battery percentage and using biteSMS. I leave only biteSMS, Mail and Phone in M/T.

Now for some strange reason i noticed lately my battery life has really gone bad! For example my battery would read 56% but after like a 5minute talk my battery drops 15% and down to 41%.. Seems like talking on the phone kills it the most.

My phone still has warranty until mid july i was thinking, should i just call apple and get that replaced while i still can and just pay the 25$.

Any advice on the bad battery life? Usually people say sometimes jailbreaks go bad and to set it up as a new phone is the best bet after jailbreaking, also this battery life seemed to have gone worse after i installed biteSMS. Is biteSMS hard on the phone can anyone enlighten me on this?

Thanks!
 
I've noticed worse battery life as well with my 3GS phone. I have a feeling it's all the background "multitasking" in the new OS. Whenever I open Trapster or another app that uses GPS, the GPS radio is always on and i'm sure that sucks away battery.

They need to have an option to say which apps are allowed to run in the background and an option to "Close All".
 
I think I fixed my iOS4 BATTERY PROBLEM on IPHONE 3GS

The day after I installed iOS4 my phone battery was dead with minimal use by mid day. This never happened in the past 6 months of owning this phone.

After reading the posts on the topic, I changed my EMAIL to MANUALLY FETCH, and I also CANCELLED the INTERNET TETHERING ( SETTINGS-->GENERAL-->NETWORK-->INTERNET TETHERING ). The following day the battery life was more normal.

Not sure if either or both solved the problem for me, but I just wanted to pass this on to the group... and HOPEFULLY to the APPLE TECHS who perhaps lurk in here and are working towards an upgrade patch.
 
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