1. jtexans's Avatar
    This happens often.

    What happened last night:

    100% battery level at midnight...remove iP5 from charger.

    Wake up around 7AM...phone is at 96%. Check 4 emails, level drops to 95%.

    Turn off and turn back on phone immediately without recharging. Phone comes on w/ battery level of 100%.

    Is this normal?
    11-24-2012 08:29 AM
  2. Nolander07's Avatar
    I think the answer you are going to get is to discharge the battery until it only has a few percent left, then fully recharge it to 100%, which will recalibrate it. It is advised to do this once monthly.
    11-24-2012 06:24 PM
  3. evorc's Avatar
    Mine has done that. It's normal. Calibrate it once a month.
    11-25-2012 12:35 AM
  4. warcraftWidow's Avatar
    Calibrate it by using it until the battery completely dies though not until its just at a few percent. And charge until completely done-overnight works best.
    11-25-2012 10:25 AM
  5. Sharma15's Avatar
    I never trusted the built in iOS battery meter. It stays on 100 and 1 for too long to be accurate. How can shutting down a phone increase battery life? It's flawed and probably uses a different metric to calculate battery life rather than power supply/total capacity.
    11-25-2012 10:27 AM
  6. warcraftWidow's Avatar
    Forcing it to go completely to 0 and then charging to 100 recalibrates the battery percentages.
    11-25-2012 10:30 AM
  7. jtexans's Avatar
    Forcing it to go completely to 0 and then charging to 100 recalibrates the battery percentages.
    I go down to zero weekly if not more often.
    11-25-2012 07:18 PM
  8. trtmazda3's Avatar
    Mine goes to 99% a lot immediately after unplugging from the charger and after turning off and back on, it's back at 100%. Both of my iPhone 4s did that and so does my 5. My wife's 4S does as well.
    11-25-2012 08:56 PM
  9. Peligro911's Avatar
    Mine goes to 99% a lot immediately after unplugging from the charger and after turning off and back on, it's back at 100%. Both of my iPhone 4s did that and so does my 5. My wife's 4S does as well.
    I always thought it was because the phone hits 100 and stops charging will drop alittle then top off again .. So catching it before it tops off again it gos to 99 fast

    Sent from my iPhone 5 from a galaxy far far away (in the USA ) using Tapatalk !
    11-25-2012 11:36 PM
  10. John Yester's Avatar
    Calibrate iPhone Battery:

    Use the iPhone until it it shuts OFF itself, due to Low Battery. Then Charge it back up without interruption, like unplugging it, to full charge 100%. Then before or after you do this, Reset iPhone, hold both home and power buttons until the iPhone restarts itself, ignore the "slide to power off slider", let the iPhone restart itself.

    Apple - Batteries - iPhone

    Some Terms You Need to Understand

    “Battery life” means the time your iPhone will run before it must be recharged. “Battery lifespan” means the total amount of time your battery will last before it must be replaced.

    Your iPhone works best from 32 to 95F

    iPhone Temperate Zone. Your iPhone works best from 32 to 95 F. You should store it in environments of -4 to 113 F. That’s 0 to 35 C and -20 to 45 C for the metrically inclined. Keeping your iPhone as near room temperature as possible (72 F or 22 C) is ideal.
    Viewing Usage Statistics

    Awareness of how you use your iPhone and knowing how long your battery typically lasts can help you improve its battery life. You can view your iPhone usage statistics by tapping the Settings icon on the Home screen and choosing General > Usage. Under the “Time since last full charge” heading you’ll see two items:

    Usage: Amount of time iPhone has been awake and in use since the last full charge. The phone is awake when you’re on a call, using email, listening to music, browsing the web, or sending and receiving text messages, or during certain background tasks such as auto-checking email.
    Standby: Amount of time iPhone has been powered on since its last full charge, including the time the phone has been asleep.

    Update to the Latest Software

    Always make sure your iPhone has the latest software from Apple, as engineers may find new ways to optimize battery performance. Using the latest version of iTunes, you can update your iPhone with the latest software. Connect your iPhone to your computer, then select iPhone in the Source List. In the Summary pane, click “Check for Updates” to see if there’s a new version of the iPhone software available. Click Update to install the latest version. If your iPhone is running iOS 5 or later, you can also wirelessly update it to the latest version by going to Settings>General>Software Update and following the onscreen instructions.

    Optimize Your Settings

    Depending on how they are configured, a few features may decrease your iPhone battery life. For example, the frequency with which you retrieve email and the number of email accounts you auto-check can both affect battery life. The tips below apply to an iPhone running iOS 5.0 or later and may help extend your battery life.

    Adjust brightness: Dimming the screen is another way to extend battery life. Go to Settings > Brightness & Wallpaper and drag the slider to the left to lower the default screen brightness. In addition, turning on Auto-Brightness allows the screen to adjust its brightness based on current lighting conditions. Go to Settings > Brightness & Wallpaper and set Auto-Brightness to On.

    Turn off push mail: If you have a push mail account such as Yahoo! or Microsoft Exchange, turn off push when you don’t need it. Go to Settings > Mail, Contacts, Calendars > Fetch New Data and set Push to Off. Messages sent to your push email accounts will now be received on your phone based on the global Fetch setting rather than as they arrive.

    Fetch new data less frequently: Applications such as Mail can be set to fetch data wirelessly at specific intervals. The more frequently email or other data is fetched, the quicker your battery may drain. To fetch new data manually, from the Home screen choose Settings > Mail, Contacts, Calendars > Fetch New Data and tap Manually. To increase the fetch interval, go to Settings > Mail, Contacts, Calendars > Fetch New Data and tap Hourly. Note that this is a global setting and applies to all applications that do not support push services.

    Turn off push notifications: Some applications from the App Store use the Apple Push Notification service to alert you of new data. Applications that extensively rely on push notifications (such as instant messaging applications) may impact battery life. To disable push notifications, go to Settings > Notifications and disable notifications for select applications. Note that this does not prevent new data from being received when the application is opened. Also, the Notifications setting will not be visible if you do not have any applications installed that support push notifications.

    Minimize use of location services: Applications that actively use location services such as Maps may reduce battery life. To disable location services, go to Settings > Privacy > Location Services or use location services only when needed.

    Use Airplane Mode in low- or no-coverage areas: Because your iPhone always tries to maintain a connection with the cellular network, it may use more power in low- or no-coverage areas. Turning on Airplane Mode can increase battery life in these situations; however, you will be unable to make or receive calls. To turn on Airplane Mode, go to Settings and set Airplane Mode to On.

    Lock Your iPhone

    It may seem obvious, but you should lock your iPhone when you aren’t using it. You will be able to receive calls and text messages while it is locked, but nothing happens if you touch the screen. To lock iPhone, press the Sleep/Wake button. You can also set the Auto-Lock interval so your iPhone will turn off more quickly after a period of inactivity. To set Auto-Lock, go to Settings > General > Auto-Lock and set the interval to a short time, such as 1 minute.

    Use iPhone Regularly

    For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).

    A properly maintained iPhone battery is designed to retain up to 80% of its original capacity at 400 full charge and discharge cycles.
    11-26-2012 12:16 AM
  11. Allarie's Avatar
    How to calibrate ipod touch 5's battery?
    08-28-2013 04:17 AM
  12. estroh's Avatar
    I go down to 0 monthly for battery health and usually recharge over night.
    08-28-2013 07:52 AM
  13. rjkgr's Avatar
    wait i thought a hard reset helps it more and arent u suppose to do it once a week?
    08-28-2013 02:48 PM

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