What's better for the iPad's Battery?

Discussion in 'iPad' started by geneticfusion, Jul 15, 2010.

  1. geneticfusion macrumors member

    Joined:
    Jan 20, 2010
    #1
    Charging from the Wall or Charging from my iMac? I usually just charge from my iMac, but I would still like to see what's better.
     
  2. redbotsoftware macrumors regular

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    Jun 2, 2009
    #2
    Charging from the an iMac through USB is very slow. So go with the wall charger.
     
  3. geneticfusion thread starter macrumors member

    Joined:
    Jan 20, 2010
    #3
    Okay, so it's a faster charge through the Wall.


    What about the Battery's health..or life, what would be better for the battery itself?
     
  4. redbotsoftware macrumors regular

    Joined:
    Jun 2, 2009
    #4
    Battery should be fine. I think the charge cycles are in the 300-500 range. But haven't you plugged it into your Mac and it'll say on the screen next to the battery, "Not Charging"? Mine does.
    So I think you really don't have a choice.
     
  5. KevinC867 macrumors 6502a

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    Jun 8, 2007
    Location:
    Saratoga, CA
    #5
    Some newer Macs provide enough power on their USB ports to charge the iPad.
     
  6. ThatsMeRight macrumors 68020

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    Sep 12, 2009
    #6
    But it's still slower than through the wall adapter.
     
  7. ssdeg7 macrumors 6502a

    ssdeg7

    Joined:
    Jul 15, 2010
    #7
    Use the Adapter

    It's a lot faster if you use the wall adapter, thus I think it should also be better for the battery, nontheless I think it shouldn't matter that much, just remember to once a month use it until it reaches 0% and then charge it to 100% (This is supposed to help conserve the battery)
     
  8. redbotsoftware macrumors regular

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    Jun 2, 2009
    #8
    What you're referring to is a problem with older type batteries, that suffered from a memory effect. This causes the battery to incorrectly show low or no charge when it still had some remaining. This is no longer the case with newer batteries which are based on lithium. In fact it may be harmful to go to 0% on Lithium based batteries, take a look at this article: http://www.batteryuniversity.com/parttwo-34.htm
     
  9. PBG4 Dude macrumors 68020

    PBG4 Dude

    Joined:
    Jul 6, 2007
    #9
    Apple recommends completely discharging lithium batteries at least once a month for maximum life/usability. It's on their site.

     
  10. Q-Dog macrumors 6502

    Q-Dog

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    Sep 9, 2007
    #10
    I don't know if it is the case with the iPad battery, but generally a slow charge is better for a battery than a fast charge. For most battery chemistries, fast charging generates more heat than slow charging, and heat kills batteries. Thus, slow charging is better to prolong the life of most batteries. Some advanced battery chargers have circuitry that monitors voltage, amperage and heat and adjusts charge rate to optimize charging and battery life.

    That said, use the apple designed charger and you will be fine. Apple designed the device and the charger to give the optimum balance between battery life and charging convenience.
     
  11. redbotsoftware macrumors regular

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    Jun 2, 2009
    #11
    That apple article clearly says "if you don't use it." Meaning the battery is sitting there not being used. They want you to charge it at least every month. I was talking about the need to completely draining to 0% then charging to 100% to avoid memory effect, which you don't need to worry about in a Lithium based battery.

    Here is what they say at BatteryUniversity.com:

    "The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery. There is no concern of memory when applying unscheduled charges."

    Also it says the same on that apple site:

    "You can also recharge a lithium-ion polymer battery whenever convenient, without the full charge or discharge cycle necessary to keep nickel-based batteries at peak performance. (Over time, crystals build up in nickel-based batteries and prevent you from charging them completely, necessitating an inconvenient full discharge.)"
     
  12. Lotso macrumors 6502

    Lotso

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    Jul 21, 2010
    Location:
    OC, California
    #12
    Hmmm thats interesting. I've also always thought it was good to let the battery die once a month. I've heard the Apple Geniuses says this to customers quite a few times. However now I really don't know...
     
  13. Stealthipad macrumors 68040

    Stealthipad

    Joined:
    Apr 30, 2010
    #13
    The best is to just enjoy and do it what ever way is best for you. Neither way is going to make a difference you could measure to the life of your battery. You iPad will give you several years of good life but you likely will want to trade it in for the iPad2 next year! :eek:
     
  14. Julien macrumors G3

    Julien

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    Jun 30, 2007
    Location:
    Atlanta
    #14
    It's not good for the battery but the complex monitoring/charging system needs re-calibrating from time to time (about once every 2 months is plenty). This is what is accomplished by running to the low voltage stopping point (lit-ion are never run dead).
     
  15. lvyelion macrumors member

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    Sep 27, 2008
    Location:
    NL
    #15
    Not a good idea, it's harmful for modern Lithium batteries.
    It’s a method used for “old” types of batteries.
     
  16. tod macrumors regular

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    Oct 3, 2009
    Location:
    Ohio
    #16
    Anyone know which ones?
     
  17. tod macrumors regular

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    Oct 3, 2009
    Location:
    Ohio
    #17
    I heard the same advice from a Segway engineer. However, he was referring to NiMH batteries, and as Segway moved to lithium-ion, they stopped recommending it. I can't imagine that the same advice doesn't apply to NiMH vs. Lithium-ion batteries in general. I just plug in my iDevices whenever I can and don't worry about it.
     
  18. 2002cbr600f4i macrumors 6502

    Joined:
    Jun 21, 2008
    #18
    The reason apple tells people to do this (and keep in mind, 0% doesn't mean completely discharged, just not enough left to turn the device on...) is to reset/recalibrate the battery metering, so it really goes to 100% when you charge it to 100%. The software that measures the stored power needs to be recalibrated from time to time and doing this sort of full discharge will reset.
     
  19. 2002cbr600f4i macrumors 6502

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    Jun 21, 2008
    #19
    No USB ports on computers put out enough power to charge the ipad WHILE THE SCREEN IS ON... If you turn off the screen for say 15 minutes and then turn it on, you'll see that it has charged the battery up some... It just doesn't get enough juice through the USB port to charge the battery and drive the display (which is the #1 power pig in the iPad.)
     
  20. Julien macrumors G3

    Julien

    Joined:
    Jun 30, 2007
    Location:
    Atlanta
    #20
    Misleading info and/or incomplete info. Please read about batteries at Battary University and then you can give more acurate advice.;)
     

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