iPad charge faster if turned off?

Discussion in 'iPad General Discussions' started by SweetPoison, Aug 28, 2010.

  1. SweetPoison

    SweetPoison
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    Or does it make a difference?
     
  2. Billee

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    Shutting it down or putting it into sleep mode will allow it to charge faster.
     
  3. wrecklass

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    Does anyone have stats on this? I charge my iPad every night and have plenty of juice to make it through a day without charging. And that is with heavy use. I never turn the iPad off, and I suspect charging with the power off doesn't make a very big difference.
     
  4. iPadCharlie

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    I also never turn my iPad off, even when I am charging it. Once in awhile I let it drain down to the point where it shuts off, but other than that, I usually put it on the charger (the one that came with it) when the batter level drops below 50%. Supposedly, these batteries don't have a "memory" like the old NiCad batteries used to have.
     
  5. Billee

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    Sleep mode doesn't use much power so there probably isn't much difference between charging while sleeping or off. There is a significant difference in charging rate if you charge the unit while using it, which is what I thought the original poster might have been asking..
     
  6. SweetPoison

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    What I wanted to know is if I turn it off, will it charge faster, back to 100%, as opposed to leaving it on and charging it.

    My cell phones charge faster if I turn them off. I think.:eek:
     
  7. SweetPoison

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    Oh. Good!
     
  8. DM51

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    I haven't seen the specs or taken any measurements, but my guess is the iPad has a Lithium Polymer (LiPo) battery with a capacity of ~6,000mAh. The discharge rate appears to be ~0.1C, and the charge rate ~0.5C.

    If that is correct, you would expect charging to take ~20% longer with the iPad left switched on than it would if it was switched off. I stress that is just a guess.

    The battery will have integral protection circuitry to prevent overcharging and over-discharging. These batteries have no 'memory effect', and don't mind frequent top-up charging. If you run your iPad down to empty, it is best for the battery to recharge it sooner rather than later, as leaving the battery in a discharged state for a prolonged period will shorten its life.

    If you have to store it unused for prolonged period (such as a month or more) store it at 50-75%, rather than full or empty.
     
  9. King Hal

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    Apple seems to force the iPad and iPhone to turn on when you plug them in and it's a nuisance then having to turn them off so I've just given up and leave them on. It probably makes an immaterial difference.
     
  10. SweetPoison

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    You seem to be very wise. And smart. Thanks for your imput!


    I knew it wasn't me! It does do that! I thought I was losin it ~ I knew I turned it off then I would plug it in to charge and it would come back on or appear on later....

    I knew it.:D
     

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