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Battery percentages incorrect?

210 Views 3 Replies Latest reply: Jan 28, 2013 7:22 PM by Malcolm J. Rayfield RSS
Mac OS XP Level 1 Level 1 (75 points)
Currently Being Moderated
Jan 25, 2013 10:40 AM

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
  • Malcolm J. Rayfield Level 5 Level 5 (4,510 points)
    Currently Being Moderated
    Jan 28, 2013 7:19 PM (in response to Mac OS XP)

    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.

  • Malcolm J. Rayfield Level 5 Level 5 (4,510 points)
    Currently Being Moderated
    Jan 28, 2013 7:22 PM (in response to Mac OS XP)

    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.

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