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Support 0% to 99% charge fast, 99% to 100% slow...

Discussion in 'Android Devices' started by CloudyTrain, Apr 27, 2011.

  1. CloudyTrain

    CloudyTrain Lurker
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    Title says it all. My battery charges quickly to 99% and then takes a long time to get to 100%. I don't know how long this has happened because I just installed a battery widget the other day. I probably have 7-8 cycles on the battery and am not rooted.

    The battery charge indicated via menu<settings<etc., shows full 100% bars for the battery, but the indicator in the notification bar still shows its charging and the widget shows its still at 99%.

    This is probably the 2nd time I've noticed this.

    Anyone else experience this or have thoughts?
     

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  2. jcnyc

    jcnyc Android Enthusiast
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    Yes i've definitely noticed this as well. Not sure whether it's just how it's suppsoed to be or a software issue but it definitely happens every time. Makes me think perhaps when it reaches 99% it is really still at 90%
     
  3. bluenik25

    bluenik25 Well-Known Member
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    Just an educated guess, but I believe this is a smart function of the battery/Phone to keep from overcharging the battery and reducing its life.
     
  4. WA_Bob

    WA_Bob Android Expert
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    That's what I've read in other places with regards to the Lithium Ion batteries used these days. All things considered, it's not going to make a noticeable difference to you in terms of how much usage/ time you get out of the battery. I do agree it's annoying, however! :D
     
  5. CloudyTrain

    CloudyTrain Lurker
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    Okay, cool. Glad to hear others are having this issue and that there might actually be a legitimate reason for this to happen. Thanks for taking the time to respond.
     
  6. skinien

    skinien Android Enthusiast
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    This is correct. I believe what's happening is the phone does a "rapid" charge to a certain capacity, then does a "trickle" charge from this capacity to 100%. When it reaches 100%, it stops charging and won't charge again until it drops down to 95% (just throwing out a number).

    Otherwise, while the phone is on the charger over night, it would constantly go from 99 to 100, back to 99 then to 100, and so on. The cells have a lifespan so this would definitely decrease the life of the battery. The "trickle" charge increases the time it takes to get from 95 - 100, so your not charging/discharging so many times when plugged in for a long period of time.

    This is also why you may unplug your phone from the charger to see that it suddenly drops to 97%.
     

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