3 Replies Latest reply: Jan 28, 2013 7:22 PM by Malcolm J. Rayfield
Mac OS XP Level 1 Level 1 (75 points)

Has anyone else noticed that when fully charged the iPhone takes a while to go from 100% to 99% and from 99% to 98%, like it has a lot of battery and it's not draining fast? But then it can drain from 30% to 20% or 20% to 10% much faster? Is that some kind of software bug or what?


iPhone 4S, iOS 6
  • 1. Re: Battery percentages incorrect?
    Mac OS XP Level 1 Level 1 (75 points)

    Also when charging, it charges up to 30 percent really fast, but it takes a long time to go from 90% to 100%.

  • 2. Re: Battery percentages incorrect?
    Malcolm J. Rayfield Level 5 Level 5 (4,805 points)

    Has anyone else noticed that when fully charged the iPhone takes a while to go from 100% to 99% and from 99% to 98%, like it has a lot of battery and it's not draining fast? But then it can drain from 30% to 20% or 20% to 10% much faster?

    Maybe the battery sensor needs calibrating.  Leave the phone on, running an app that draws power (such as a flashlight or movie) until it shuts off, then charge it to 100%.  You should do this every month or so.

  • 3. Re: Battery percentages incorrect?
    Malcolm J. Rayfield Level 5 Level 5 (4,805 points)

    Also when charging, it charges up to 30 percent really fast, but it takes a long time to go from 90% to 100%.

    That's normal.  The battery must be charged slowly when almost full or it can catch fire.