Battery randomly goes down to 99%?

Discussion in 'iPhone' started by ajohnson253, Sep 10, 2009.

  1. ajohnson253 macrumors 68000

    ajohnson253

    Joined:
    Jun 16, 2008
    #1
    I'll leave my iPhone plugged in over night I'll look a it and it will be at 100%. Look at it a couple hours later and it will randomly be at 99%.
    Anyone know what's going on here or seem to have the same problem?
    Not really a problem just curious.
     
  2. abijnk macrumors 68040

    abijnk

    Joined:
    Oct 15, 2007
    Location:
    Los Angeles, CA
    #2
    It has to do with the way the the battery controls the charging cycle. The name of the process/feature escapes me right now...
     
  3. ajohnson253 thread starter macrumors 68000

    ajohnson253

    Joined:
    Jun 16, 2008
    #3
    Appreciate it. I haven't done that yet to my 3GS. Probably why it was reading it like that.
     
  4. bbplayer5 macrumors 68030

    Joined:
    Apr 13, 2007
    #4
    You guys are dense if you dont think this is a problem. Each battery has a life of around 3-400 charge cycles. Having your phone go down to 99% every 30 minutes or so over night causes those cycles to add up QUICKLY. My previous generation phones NEVER... I repeat... NEVER did this.

    Its not anal, its called money. Remember we cant replace our phones battery...
     
  5. -aggie- macrumors P6

    -aggie-

    Joined:
    Jun 19, 2009
    Location:
    Where bunnies are welcome.
    #5
    Well, you quoted me before while I was deleting. I decided you might not like my joking response. Guess you were okay with it.
     
  6. Vegastouch macrumors 603

    Vegastouch

    Joined:
    Jul 12, 2008
    Location:
    Las Vegas, NV
    #6
    I keep my percentage turned off. That way i dont worry about little stuff like this. When it is in the red then i recharge it.
     
  7. mackmgg macrumors 65816

    mackmgg

    Joined:
    Nov 2, 2007
    #7
    Once cycle isn't a charge, but rather a full charge. If you drain it to 50% once, then recharge it, then 75% twice and recharge it thats 100%, and counts as one charging cycle
     
  8. Vegastouch macrumors 603

    Vegastouch

    Joined:
    Jul 12, 2008
    Location:
    Las Vegas, NV
    #8
    You can absolutely change the battery or you can send it some place to have it done , but it can be done.

    Here is one place off the top of my head. I know there are a few. http://www.iphonereplacementparts.com/
     
  9. lollicup macrumors regular

    Joined:
    Aug 20, 2009
    #9
    I agree with iphone.aggie's comment. Its one thing if you accidentally notice this, but it seems like it actually bothers you /keeps you up at night >_<

    most battery circuits are not concerned about keeping the battery at 100% ( my plugged in laptop right now shows 99%)

    IF you are really concerned then I would completely drain and charge your phone 3x in a row, this will calibrate the battery if it is off.
     
  10. abijnk macrumors 68040

    abijnk

    Joined:
    Oct 15, 2007
    Location:
    Los Angeles, CA
    #10
    Whoa, overreaction and utterly wrong.

    So, I think there is a term for this that is more technical, but I'll do my best. Li-ion batteries can't handle overcharging, so trickle-type chargers aren't used. Instead, a sort of "smart charging" is used where the battery is charged up to a certain threshold where they are considered "full." Then charging stops to prevent overcharging and the nastiness that can occur there. So at this point, the phone is still plugged in, but not charging, so naturally the charge starts to dissipate. Is going to dip back down below that threshold and then start charging again, back and forth back and forth. This is registering on your battery percentage as a one percent drop, but its certainly not going to rack up charge cycles abnormally fast.
     

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