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Bpatton711

macrumors newbie
Original poster
Apr 25, 2015
6
0
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?
 

H3rman

macrumors 6502
Apr 16, 2015
474
21
They will all charge your watch the same. None will be any quicker than another.

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.
 

H3rman

macrumors 6502
Apr 16, 2015
474
21
I will bet you $100,000 that the 5 Watt charge can supply more power than the Apple Watch can handle.

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:
 

iregret

macrumors 6502a
Jan 23, 2012
525
120
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:

I'm not sure what the limitations of inductive charging are.
 

Cloudsurfer

macrumors 65816
Apr 12, 2007
1,319
373
Netherlands
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...
 

profets

macrumors 603
Mar 18, 2009
5,130
6,254
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:

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.
 

coolfilmaker

macrumors member
Jul 25, 2012
94
1
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:

My apologies to your employers.
 
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