12 Replies Latest reply: Dec 4, 2010 1:05 PM by exq0867
exq0867 Level 1 Level 1 (0 points)
Has anyone had problems with the battery meter after updating to 4.1? The meter is correct while discharging, but not while charging. To get an accurate reading after a charge, the only solution I've found is rebooting the phone. I've tried several times with the same result. Also, I've tried draining to see if recalibration was needed or something. Any help would be appreciated.

iPhone 3G, iOS 4, iOS 4.1
  • Bugfixer Level 1 Level 1 (125 points)
    I've noticed no difference with 4.1; are you maybe using an iPad charger? That charger is not supported and it happens that the iPhone 3G charges fast but the battery meter (level) remains low.

    I had to reboot to have the correct level back.
  • exq0867 Level 1 Level 1 (0 points)
    I was using an iPad charger. I'll check it out and see what happens. The only thing is that it was never a problem before with this charger. It seems like this is something in ios 4.1 that has changed from 3.1.3.
  • exq0867 Level 1 Level 1 (0 points)
    The statement above regarding lack of compatbility is outright wrong. The link below clearly states that the iPad charger IS compatible with iPhone 3G. This is obviously a software issue.

    http://store.apple.com/us/product/MC359LL/A?aosid=p204&siteid=1503186&program_id =2554&cid=OAS-EMEA-AFF&tduid=753b325ddbae6ee7ea0f0ea135abad77&fnode=MTc0MjU4NjA& mco=MTcyMTgxNzE
  • Bugfixer Level 1 Level 1 (125 points)
    You're right. This is a BUG in iOS4 (even if I remember the problem also with 3.1.3). Thanks for pointing this out.
  • Monty1945 Level 3 Level 3 (690 points)

    There is likely no issue with your phone/software, other than you may need to calibrate the meter. That old phone can have a meter go out of calibration with the installation of iOS 4.1, especially if you are going straight from 3.13.

    All you have to do is to charge it up overnight, then run it down all the way until it shuts itself all the way off, not just go to sleep. After that let it rest a half hour or so, and fully charge it, without using it. It's best to plug it in, and then do a full shut down, and let it charge fully. The meter should be in calibration, after that.

    I've seen some folks have to do this a couple of times, if they continually short charge it, but once is usually enough.

    I wouldn't pay too much attention to what the meter says while it's charging, as other things are going on that will make the meter fluctuate a bit, since it's on.

  • Bugfixer Level 1 Level 1 (125 points)

    Does this mean that I can't use both iPad and iPhone charger? If I calibrate for iPad charger, how does it work with the iPhone 5W charger?
  • rimshaker Level 3 Level 3 (515 points)
    4.1 shuts off automatically when battery runs down to 5%. So when you plug it in, the phone simply boots up and is ready to go. Whereas with older software it will shut off when the battery is literally dead below 5%... then it took a little extra time before enough charge is built up so the phone can power on.
  • JBDavis2010 Level 1 Level 1 (0 points)
    I just upgraded my 1.5 y/o 3G to 4.1 and have been having noting but problems. The worst is that I leave it plugged in all night but it still shows low battery in the morning. If I re-start it, it shows that I have a full charge. Will resetting the battery meter as it says above fix this?

    Since installing it my batter life has decresed signifigantly.

    And when I go to view my photos in Camera Roll 3/4 of them are blacked out when I look at the thumbnails, to see them at all I have to enlarge one and skim through them all.

    Any fixes? I can't go to an apple store because there isn't one close to where I live.
  • Ray1025 Level 1 Level 1 (0 points)
    My battery indicator is not reliable. If I'm on the internet, the battery indicator will drain down to red level within about 10 minutes, and then the iPhone will shut off. Upon being turned back on, the indicator will show about 30%. But the phone will turn off after just a few minutes of use.

    Yesterday, after a full night's charge (a must every night, and usually at least once during the day also), I took one picture and was in the process of emailing it, when the phone just shut down. Upon turning it back on, the battery showed less than 20%. Ridiculous!!

    Most of the time the battery appears to be drained, but occasionally, upon turning the phone back on an hour or so later, the battery will show at greater than 50%. I use this phone for business, and I've come not to rely on it -- very frustrating. I need to make a change within the next two days!

    iOS 4.1 on an 18-month old 3G.
  • dannyboy223 Level 1 Level 1 (0 points)
    I have the same problem here using the iPad charger since iOS update to 4.1 (didn't have this issue before). It shows battery level @20% when the battery is actually fully charged. Once I stick my iphone into my iphone/ipod-dock equipped radio, it 'charges' within 5-10 min. to 100%.

    Have to try my default iPhone charger once I get my hands on it to see what difference it makes.
  • JonBoardy Level 1 Level 1 (0 points)
    Yes, I am having the same problems. Very unreliable battery indicator on my 3G since upgrading to iOS 4.1.

    At first I thought my battery was having problems, but then realised that the problems only started after the OS upgrade.

    Rebooting does seem to reset the battery meter.

    Seems to be a bug to me.
  • exq0867 Level 1 Level 1 (0 points)
    The solution here is apparently to go to 4.2.1. I am not sure if there was a bug or whatever in 4.1, but whatever it was was resolved in 4.2.1 and the battery meter appears to be accurate. No significant problems in performance or battery life that I have run into.

    BTW, I did not go the update route, but rather the restore route.