iPhone 3GS with fw 3.1 – battery life gets even worse

I noticed that after the upgrade, I am losing about 20% of my battery life per standby hour, which isn't usable. I have push and bluetooth on, as well as an Exchange account and 4 others (Gmail, Yahoo, Live and AOL) After it being fully charged yesterday, it was down to 5% after 4 hours of standby and 20 minutes of talk time.

I have tried to power it down and fully charge it and we will see what happens.

Since Li-ion batteries do lose it's charge overtime, I think it's the calibration. Even though we don't need to cycle the battery to keep it healthy, we do need to cycle it every once in awhile for the software to calibrate. I am assuming after the update the phone calibration resetted. Try running the battery down to it's shut off and asks for you to plug it to an adapter. After that, charge it fully to 100% then report back.

I had a similar issue with a laptop battery calibration. It was showing my battery was very low after a short period of usage, but it seemed to take forever to run the battery run down. After the automatic shutdown the next full charge did not have the issue.

Keep in mind that draining Li ion batterie til it's truly dry can be harmful for the battery. Also, you should run the battery low every now and then for your software to calibrate, I would say once a month atleast. All batteries depreciate over time, regardless of usage. It is a proven fact that temperature plays a role in this. Try to not keep the phone hot very often as high temperatures depreciate battery health faster

I've tried this twice and it doesn't help any. I have tried a reboot and will see if that helps. Thanks for the suggestion, though.

It's possible that it's the calibration, but I'm beginning to think not. I didn't get very good battery life with 3.0, but it increased dramatically with 3.01.

Now, with 3.1, it's bad again. I'm losing 1% battery every 5 mins or so just playing the ipod (audio only). Any work I do on the phone itself (changing settings, reading email, and the like) just crushes the battery.

I'm having the same issues with the 3.1 update on my 3GS.
Battery drain is extensive (around in a 3 mins 1% off when battery is fully charged).
I haven't had these huge issues with 3.0 and 3.0.1

Please fix in a future update.

I noticed this right after installation! My battery went from 100% to dead 1% in about 4 hours watching 1 40 min video and brief Internet usage. This has now happened all day today. Went from a full 100% charge at 7:00 AM and the phone has been in standby all morning. Typed 3 e-mails and now I am at 35% battery life! This is HORRIBLE! I cannot believe nobody in testing could have NOT seen this error? Absolute junk - need to get 3.0.1 back on or I cannot even use the device!

I have the 3G and the battery seems actually a lot better !!!

I performed that without actually trying! My battery went to completely DEAD last night. Charge all night OFF so I had 100% this 7:00 AM. Its now 11:00 AM and I am at 34% after writing 3 e-mails and having the phone in standby.

I hope this battery drain is not due to Exchange support as mentioned in another post! This is absolutely a disaster if that's the case for anyone getting e-mail from an Exchange server! Apple, please respond as some say battery life is better with 3.1 and MOST are not seeing this but it being far WORSE. I have Exchange ON and almost no battery left!

My battery life has been cut in half. I have tried the restore and would like to go back to 3.0 until Apple resolves problem. Can anyone help?

I have the same problem!!!!!!

40% battery life now compared to 3.01 software

😟

Whats wrong?

so i am by no means an iphone noob, and i did all the basic stuff they tell u ... yesterday i charged my phone 3 times during the day... thats not normal.. i had 3.1,(beta) not 3.1.1 and it was fine.. i did a complete restore to my phone for 3.1.1 and set up as new... ran my phone to dead before pluging it in again last night... charged it all night... woke up started using my phone... everything is ON like i did with 3.0 and 3.1(i was getting 4 hours of heavy usage) right now my phone is 53% with 1 hour of usage and 5 hours and 4 minutes of standby... something is wrong.. obv not the phone lol
im mad

The iPod Touch 1G also suffers horrible battery performance after the 3.1.1 update. Fully charged this morning, and now at 22% four hours later. Both iPhone and Touch affected!

Anyone find any work around to this yet? I've let the battery run all the way down and then charged it to 100% two or three times now with no positive results. This makes the phone almost unusable.

my battery seems to know im complaining , it got stuck at 44% and now i have 39% 2h18m usage
and stanby is 7h30m