Is it safe to use a higher watt charger on the new iPad?

Discussion in 'iPad' started by Yr Blues, Mar 20, 2012.

  1. Yr Blues macrumors 68020

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    #1
    Just curious. A third party solution might be in order.
     
  2. Intell macrumors P6

    Intell

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    #2
    Yes, but the iPad may not use the extra power and limit its intake to 2A which is 10 watts at 5V.
     
  3. Yr Blues thread starter macrumors 68020

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    #3
    Someone needs to try this and post results. I haven't bought the new iPad yet.
     
  4. w00t951 macrumors 68000

    w00t951

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    #4
    The charging is regulated from the device. Apple could make it charge faster, but that would produce exponentially more heat. I bet this is the perfect balance Apple could find.
     
  5. Yr Blues thread starter macrumors 68020

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    #5
    If that's the case, I can deal with it. As long as they try their best. They have to play by the laws of economics and physics.
     
  6. gr8tfly macrumors 603

    gr8tfly

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    #6
    Just a note about LiPo batteries in general:

    Even if the device would allow charging at higher rates, it could be at best, damaging to the cells; at worse, result in swelling, bursting, or possible fire. It would depend on how much over the amount and rate allowed for the cell being charged.

    I would highly recommend leaving it to Apple's engineers to have worked out the best charge curves balanced with internal heat dissipation - all while keeping the rate well below the maximum set for each cell.
     
  7. Yr Blues thread starter macrumors 68020

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    #7
    Makes sense. I won't risk it.
     
  8. Archer1440 macrumors 6502

    Archer1440

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    #8
    The RC crowd knows how this is done, but the fact is Apple has to balance battery longevity with charge rate and thermal management in a sealed case. RC LiPo powered models and Mac Airs don't have this issue.

    Faster charges = more heat = shorter lifespan.

    /Scotty voice ON: "Ye canna change the laws of PHYSICS capt'n" /Scotty voice OFF
     
  9. UrsaMajor macrumors regular

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    #9
    Oem charger is best. The device has a voltage regulator to cut off any amount of draw above the "safe" amount.
     
  10. Intell macrumors P6

    Intell

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    #10
    You can use a 10 amp charger, pending you don't short out the iPad's circuitry, it'll still only charge at 2 amps. There is nothing wrong with using higher amp chargers with iPads, iPhones, or iPods.

    iOS devices only fast charge to 80%, they then slow charge to 95% and trickle charge to 100%.

    The OEM charger doesn't have such circuity. The regulator is within the iPad.
     
  11. gr8tfly macrumors 603

    gr8tfly

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    #11
    Aside from my engineering experience, I also learned a lot when building model aircraft - using LiPo for engine power being the most challenging. You're always tempted to push it a bit to get that one last flight in (most resisted the temptation - especially after seeing the remnants of someone's failed charge attempt, at the next club meeting ;) )
     
  12. Tinmania macrumors 68040

    Tinmania

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    #12
    If you mean burning or puffing up more lipo batteries than acceptable in any consumer electronic product then, yea, they know how it is done. :)




    Michael
     
  13. Archer1440 macrumors 6502

    Archer1440

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    #13
    That's precisely what I meant.
     
  14. TB07-NJ macrumors 68020

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    #14
    Wrong. It's a standard USB charger. Internal circuitry in the iPad controls the charging rate. Sure, it may have a fuse but that's no different from any other USB charger.

    ----------

    Except in Heli's & park flyers the battery usually has room to eeexxxpppaannddd.
     
  15. Intell macrumors P6

    Intell

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    #15
    It doesn't fit the USB spec. USB spec is 500mA at 5 volts. The iPad's is 2 amps at 5 volts.
     
  16. Tinmania macrumors 68040

    Tinmania

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    #16
    Hehe.



    Michael
     
  17. TB07-NJ macrumors 68020

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    #17
    I didn't say "spec." I meant in terms of protection from overcharging.
     
  18. Intell macrumors P6

    Intell

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    #18
    Still not a standard USB charger.
     
  19. TB07-NJ macrumors 68020

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    #19
    OK, you win. IT'S NOT A STANDARD USB CHARGER. Does that make you feel better? :rolleyes:
     
  20. Intell macrumors P6

    Intell

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    #20
    Not really. Internet arguments are such fruitless trivial things. But what will make me feel better is a plate of cookies magically appearing on the table next to me.
     
  21. TB07-NJ macrumors 68020

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    #21
    How profound.
     
  22. master-ceo macrumors 65816

    master-ceo

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    #22
    Yep, A rapid charge generates major heat. Those batteries won't last too long.
     
  23. BHP41 macrumors 6502a

    BHP41

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    #24
    I really can't see why this is a issue. If you use your iPad all day, the you either don't work or are out of school and have nothing better to do. Either way you have access to a charger.

    If you use your iPad all day for work then it will last....all day. At night while you sleep plug it in and start the process over again. Can't fathom why anyone would need this thing to charge faster than it does. I put mine on charge at 30% at 1700, came back to it at 2000 and it was at 80%.
     
  24. gnasher729 macrumors P6

    gnasher729

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    #25
    An iPad takes up to 2 Ampere / 10 Watt from the charger. If you have a 20 Ampere / 100 Watt charger, the iPad will still only take 2 Ampere / 10 Watt. So the iPad won't get damaged, and it won't charge any faster.
     

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