Charge Times - 12w v 10w v 5w

Discussion in 'Apple Watch' started by Bpatton711, Apr 25, 2015.

  1. Bpatton711 macrumors newbie

    Apr 25, 2015
    Has anyone tested how fast the watch charges with different wattage chargers? My iPhone 6 charges from dead to 100% in a little over an hour with the the 12w apple charger. Will the apple watches charge faster using the higher wattage chargers?
  2. largefarrva macrumors 6502a

    Jun 30, 2012
    They will all charge your watch the same. None will be any quicker than another.
  3. H3rman macrumors 6502

    Apr 16, 2015
    Not necessarily true. The watch will draw however much power it wants/needs to charge. The 5w charger might not be able to supply as much as the watch can handle.

    Just like with the iPhone 6 & 6+, Apple supply a 5w charger, but the phone chargers twice as fast with the 12w charger, because the phones integrated charging circuitry can handle quicker charging and will draw additional current from the larger charger that the smaller ones can't supply.

    This May or may not be the case with the Watch also. Only 1 way to find out.....try it! It won't cause any damage, because the watch will just draw however much power it wants and it's integrated charging circuit will regulate power coming in. The charger will just supply what is asked of it. It can't "force" additional power into the watch.
  4. coolfilmaker macrumors member

    Jul 25, 2012
    I will bet you $100,000 that the 5 Watt charge can supply more power than the Apple Watch can handle.
  5. H3rman macrumors 6502

    Apr 16, 2015
    It is easily possible that the charging circuitry within the watch could be rated to charge faster than the 5w chargers allow. I am not saying that it definitely is, but you seem to imply that because it's a small device with a small battery that means it's not possible.

    I do know what I am talking about. With a degree in electronic engineering and working as a hardware engineer this stuff is what I deal with day in day out....:rolleyes:
  6. iregret macrumors 6502a

    Jan 23, 2012
    I'm not sure what the limitations of inductive charging are.
  7. Natzoo macrumors 65816


    Sep 16, 2014
    Not sure where i am
    unless you charge your iPhone 6+ with the iPad charger. Sad how they didnt include that with the 6+
  8. Cloudsurfer macrumors 65816


    Apr 12, 2007
    The 12W charger will only charge the Watch quicker if it accepts the higher output current. It may be limited to 5W due to heat constraints, etc.

    The iPhone 6 accepts the higher current of the 12W charger, but it also has a larger surface area for heat dissipation...
  9. randy98mtu macrumors 65816


    Mar 4, 2009
    They list the 12W as an accessory which makes me think it would use it.
  10. omegis83 macrumors 6502

    Sep 19, 2014
  11. profets macrumors 601

    Mar 18, 2009
    I don't think it being a small device / small battery meaning it's not possible. I'd make a guess based on what we know. It uses inductive charging, it has a small battery (205 mAh for the 38mm) and with the 5W charger it takes nearly 2 hours to charge.

    I'd guess there's a limitation of either the inductive charging or the circuitry within the watch, otherwise I would expect a 5W charger to be capable of charging a 200 mAh battery faster than 2 hours.
  12. Brookzy macrumors 601


    May 30, 2010
    Thanks for this.

    I suspected there was no benefit as the 10W charger I used was noticeably cooler while charging the Watch compared with charging the iPhone.
  13. coolfilmaker macrumors member

    Jul 25, 2012
    My apologies to your employers.

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