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I received my 3GS four days ago and went about setting it up right away. The phone was an upgrade to my 3G which I handed over to my wife. I set up the phone - from a backup - exactly as per my 3G (also on 3.1.2). Settings are as follows:
- 3G off (useless signal here)
- Wi-fi on
- Bluetooth on
- Push off, fetch 30mins
- Brightness approx 45%
Immediately, I noticed that the battery life was concerning. The phone was hot and the battery life was diminishing before my eyes, as described countless times on this thread. If anything, as I had set up my new phone from a backup and my wife was new to iPhones, the older 3G was fiddled/tweaked and played with considerably more than the 3GS. The difference between the two was staggering.
- Cue annoyance, multiple Google searches and a very long read of this thread.
Firstly, I restored the phone as new - losing my app data and messages etc. wasn't a massive deal to me. There was an immediate and noticeable increase in battery life, but still not as good as the 3G. Next, I carried out a full discharge/charge cycle. Result: the phone is no longer hot and the battery life is much improved (though still not as good as the 3G, perfectly acceptable for me as it will allow a good full day's usage). I do recall my 3G and BB storm batteries improving over time, so I am actually quite hopeful.
At present, I have 82% battery left at 6pm, after unplugging at 9am. On first setup, my 3GS would barely have made early afternoon before I restored it as new, and I am quite confident that things will improve from here.
Clearly, the causes are definitely multifactorial, and one solution for one may be a waste of time for another. However, given the night and day difference I have seen, I would strongly recommend that the above is tried - if possible/feasible - before giving up hope or returning the phone.
I'm keeping a close eye on things but am cautiously optimistic that my planned visit to the Genius Bar may not be necessary at all. Thanks to all who've contributed to the thread and given me my solution.
My solution for iPhone 3GS 3.1.2 non JB:
- remove any apps that use push notification;
- backup iPhone through iTunes;
- reset iPhone and restore last backup;
- complete discharge (until iPhone shut down);
- complete charge (I didn't disconnect device for many hours although battery shows 100%);
After the procedure I turned off almost anything for testing:
- 3g: OFF
- WiFi: OFF
- Bluetooth: OFF
- Push: OFF (the menu for activation should disappear because you wouldn't have any push apps installed)
- Mail check: OFF
My first test day:
- use: 1h32
- standby: 12h11
- calls: 0h32
- data send: 265KB
- data received: 4,0MB (just few mails manually checked and poor 3g internet navigation)
and I have still 79% of battery resource...seems good!!
I suppose there are many application localizated that use push that makes iPhone works even if you have disabled Push.
Next days I'll try to reinstall suspected apps for other tests.
Hope being useful and hoping Apple will resolve this bug ASAP and I apologize for my poor english :P
3.1.2 here and I have had many of the reported issues ie bad battery life, stuck battery percentage then rapid drain, 1 hour full charge ups.
3G - on
WiFi - on
Bluetooth - on
Push Email - on
Fetch - every hour for 1 account
Location Services - on
Push notifications - on
I used to get about 6 hours usage with all of these on. Now I am lucky to get 3. Additionally, my 3GS fully charges to 100% in about an hour, indicating that something is seriously off. Also I experience stuck battery percentage from time to time where it will be stuck at some number and then all of a suddent will jump to 5%. I have done battery conditioning and this does not help. Additionally when I took it to the Genius Bar, I was told that everything was fine from a diagnostic standpoint.
Opinions? I don't want to have to beg a Genius to replace this phone and further more don't want to do that if this is just a software glitch, and not related to physical hw. Opinions? Should I go for replacement again or just wait for the next update to fix the battery.
Also if any Apple employees are monitoring, please email me if you can. I would really love to run the battery logging to get to the bottom of this.
follow the advice of the last 2 users:
1. Turn off push, make fetch manual, turn off notifications. Keep everything else on.
2. Restore as new user
3. From full charge let it fully discharge until it turns off (you can do this easily by not autolocking the screen, turning the brightness all the way up, and play music loud into headphones.
4. Let it charge fully and even beyond a few hours.
I did this and get acceptable battery life.
The solution described by me previously is still proving to be very efficient, at least for me. My standby usage is totally normal, losing only a couple of percents during a whole night.
The active usage seems ok, listening music will make the battery drop by 2 to 3 % per hour. Movies and games take two or three times more but that's to be expected.
My current daily config is:
3G : ON
WIFI : OFF
LOCATION : OFF
PUSH : OFF
FETCH : OFF
With the very good results I have by turning off the wifi, I'm starting to turn back on all the other sensitive features one by one to see their toll on the battery life.
I'm currently running almost everything except wi-fi of course and bluetooth which I don't need and I have very good standby battery life.
3G : ON
LOCATION : ON
PUSH : ON
FETCH : ON
WIFI : OFF
BLUETOOTH : OFF
Facebook pushes also all turned on.
It's really boils down the the wi-fi for me.
I'll try to do more test to see if the drain occur only if I'm connected to a network.
Update on my situation. I did a Reset All Settings and then just made sure that wifi doesent search for networks and I am back to getting 6+ hours of battery life. Back to normal for me with almost everything on. I did try to do the wifi doesent check for networks option before the reset and it didn't help much. My impression is that this is 100% software related.
Solved: +"I turned everything off, and my battery is good after several days."+
Come one people, it is a SMARTPHONE - you are not supposed to turn things off, to have it work!!
And it all worked good BEFORE the 3.1.1 update!
APPLE - ***!!!???
I suggest that all people that read this refers to this thread and leaves a feedback bug report here:
To turn everything off is "just" a way to check that the battery is not broken to avoid a two weeks stop waiting the apple maintenance.
Turning everything off, my iPhone works for almost 3days (never appened before), but I don't means that this is a solution for this annoying bug! Actually I have to use my device so I renounced to push nofitications, 3G always on hope that apple fix it asap.
many thanks for the link
I had all the same issues, and read this WHOLE thread. It's the wifi setting. Confirmed (for me) workaround to fix 3GS 3.1.2 battery life issues, until Apple releases an actual software fix:
1) take backup of phone
2) reset phone to original factory settings
3) restore backup of phone
4) DO NOT toggle WiFi on
5) drain battery to dead
6) charge battery to full
*if WiFi must be used, after use repeat steps 1-6
very lame for WiFi users but I'm all 3G so leaving WiFi off is fine by me, and has put my battery life back to norm