Previous 1 2 3 Next 35 Replies Latest reply: Dec 6, 2010 10:02 AM by jeffkinn_uk
RiverCrab Level 1 (0 points)
Last night I went to bed with 50% of battery on my iphone 4. Nothing was on except wifi, no app DLed from app store, autolock in every minute. This morning when i got up the phone was dead and i cant even turn it on. After some observation i found out that with my wifi on, it drains 5% of battery per hour. If i turn wifi off, the battery didn't drop anyting after one hour. Is that a common problem or just me? Do i need to go to apple store to change another one?

thx

iphone 4, iOS 4
  • wjosten Level 10 (94,210 points)
    What OS is on your phone? Persistent WiFi was removed with iOS 4.1, so if your phone is on iOS 4.0, update your phone.
  • RiverCrab Level 1 (0 points)
    mine is OS 4.1. just bought it last Friday
  • wjosten Level 10 (94,210 points)
    Possible that an app got stuck on your phone, it happens. Most likely culprit is your mail app. Is your battery life fine now? If so, don't worry about it. However if your battery life is still bad post back.
  • iPhoneMerc Level 1 (0 points)
    I bought mine last Tuesday and notice that the battery does drain a little faster than what I thought it should. Please keep us informed.
  • RiverCrab Level 1 (0 points)
    Hi, i've also reboot the program last night and there is no app running in the background. i also double clicked home key to make sure. sadly, wifi is still drains my battery around 5% per hour.
  • wjosten Level 10 (94,210 points)
    Settings>Mail, Contacts, Calendars>Tap on your Account>For Mail(or anything else listed)>Switch to off. Then, launch your mail app, verify that your account is turned off. Then, reset your phone: Press the sleep/wake button & home button at the same time, keep pressing until you see the Apple logo, then release(ignore the slide to power off). I'm assuming here you're not using any apps that do run in the background, correct?
  • RiverCrab Level 1 (0 points)
    actually i didn't add any accounts for my emails yet. but i'll try set one up and then turn it off and see if there is anything changed. thanks
  • wjosten Level 10 (94,210 points)
    Your problem is not a stuck mail account, since you've never setup mail. Reset your phone though, this should stop anything running in the background. Turn WiFi off in settings. Monitor your battery usage. If things appear normal, turn WiFi back on. Again, monitor your battery usage.
  • RiverCrab Level 1 (0 points)
    funny thing is that in the usage, the usage and standby shows "-". i've fully charged my iphone like 2 hours ago. even i didn't USE it, at least it should shows the standby time. But it shows nothing now.
  • Lawrence Finch Level 7 (34,916 points)
    RiverCrab wrote:
    funny thing is that in the usage, the usage and standby shows "-". i've fully charged my iphone like 2 hours ago. even i didn't USE it, at least it should shows the standby time. But it shows nothing now.

    If you reboot the phone it will not show usage until it has been fully charged.
  • RiverCrab Level 1 (0 points)
    for reboot i mean reinstall the system back to the factory mode

    null
  • Lawrence Finch Level 7 (34,916 points)
    If you are a moderate to heavy user you will need to charge the phone every night. That is normal. If you cannot get through a day of usage (unless you spend 5-10 hours using it during the day) that is not normal.
  • Lawrence Finch Level 7 (34,916 points)
    RiverCrab wrote:

    WiFi doesn't drain anything in Sleep mode because WiFi is turned off in sleep mode. Something else is causing the heavy battery drain.

    As you said you don't have any email accounts it isn't email. Safari can drain the battery if left on a page that automatically refreshes.

    Location Services can drain the battery - if you see an arrow in the top bar near the right then there is an app running in background and using location services.

    Game Center can drain the battery even when it is closed.

    Streaming apps, social networking apps (facebook, yahoo, skype, etc) can also drain the battery in sleep mode.
  • RiverCrab Level 1 (0 points)
    Hi, im not a heavy-user. i just left my phone with wifi on before i went to bed with 50% of battery. then after a 10 hours sleep, my phone's battery is gone. during the time i didn't even touch my phone.
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