Why doesn't the iPhone 3GS smart charge?

Discussion in 'iPhone' started by WilliamG, Jun 27, 2009.

  1. WilliamG macrumors 604

    Joined:
    Mar 29, 2008
    Location:
    Seattle
    #1
    My MacBook Pros won't start charging until they fall below 95% charge.

    If you unplug the iPhone 3GS, and then plug it in after it hits 99%, it starts charging again! I've woken up in the morning and looked at my phone and the battery has hit 99% and is charging again...

    Anyone else find this behavior odd?
     
  2. rKunda macrumors 65816

    rKunda

    Joined:
    Jul 14, 2008
    #2
    A little. Though most people likely don't have their phones plugged in on their desks all day, like some people do with laptops. Maybe it wasn't considered necessary?
     
  3. WilliamG thread starter macrumors 604

    Joined:
    Mar 29, 2008
    Location:
    Seattle
    #3
    It just can't be good for the phone. I'm pretty sure the iPhone 2G and 3G both smart charged. The problem is that if you leave the 3GS plugged in overnight, it charges to 100%, stops charging, and then will drop to 99% an hour later (or whenever that is), and then charges again to 100%. So there's a lot of "bit" charging going on here... Can't be good for the battery...
     
  4. DotComCTO macrumors 6502

    Joined:
    Aug 17, 2006
    #4
    I've never seen that happen - even with my 2G iPhone. Maybe I'm not observant enough, but both of my iPhones (2G and 3GS) go to 100% and stay there...at least that's how it seems to me!

    Weird.

    :apple:

    --DotComCTO
     
  5. Johnathan macrumors member

    Joined:
    Sep 12, 2008
    #5

    You don't know what it's actually doing, you only know what the phone is reporting that it's doing.
     
  6. hchavarria macrumors 6502

    Joined:
    Oct 8, 2008
    #6
    My iPhone says 100% when it's plugged in but when I unplug it's at 98% and draing real fast.
     
  7. WilliamG thread starter macrumors 604

    Joined:
    Mar 29, 2008
    Location:
    Seattle
    #7
    O....K.....
     
  8. doubleatheman macrumors 6502a

    doubleatheman

    Joined:
    May 27, 2009
    #8
    My kill a watt meter reports a constant 1 watt drain even after the iPhone is fully charged, could be a trickle charge, or the power required to keep the phone in standby, or the inneficency in the charging process.

    The iPhone itself requires 5-6 watts of power when at full speed charge, then goes to 3 watts at 80% charge, and the. 2-1 watt for the rest.
     
  9. OneMike macrumors 601

    OneMike

    Joined:
    Oct 19, 2005
    #9
    I've started keeping my phone plugged in while at work and have never noticed this. This was with 2g. From what I see was always reported as fully charged. Will confirm tomorrow with 3gs
     

Share This Page