Why doesn't the iPhone 3GS smart charge?

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

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  1. WilliamG, Jun 27, 2009

    WilliamG macrumors 604

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    #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?
     
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  2. rKunda, Jun 27, 2009

    rKunda macrumors 65816

    rKunda

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    #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?
     
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  3. WilliamG, Jun 27, 2009

    WilliamG thread starter macrumors 604

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    #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...
     
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  4. DotComCTO, Jun 27, 2009

    DotComCTO macrumors 6502

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    #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
     
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  5. Johnathan, Jun 28, 2009

    Johnathan macrumors member

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    #5

    You don't know what it's actually doing, you only know what the phone is reporting that it's doing.
     
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  6. hchavarria, Jun 28, 2009

    hchavarria macrumors 6502

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    #6
    My iPhone says 100% when it's plugged in but when I unplug it's at 98% and draing real fast.
     
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  7. WilliamG, Jun 28, 2009

    WilliamG thread starter macrumors 604

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    #7
    O....K.....
     
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  8. doubleatheman, Jun 28, 2009

    doubleatheman macrumors 6502a

    doubleatheman

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    #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.
     
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  9. OneMike, Jun 28, 2009

    OneMike macrumors 601

    OneMike

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    #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
     
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