Charge an iPhone with an iPad?

mrcalabash

macrumors member
Original poster
Mar 8, 2011
99
0
This may seem like a weird question, but I was idly wondering is there a way--cable of some sort--that would charge an iPhone from an iPad. I mean, the iPad has a bigger battery, so it's theoretically possible to use some of that juice for the iPhone.

Maybe this question is only a thought experiment. I googled and found nothing.
 

Night Spring

macrumors G5
Jul 17, 2008
13,074
5,173
Theoretically, it seems possible, but someone will have to make a special cable that does it, and as darngooddesign pointed out, there would need to be a way to tell the cable which device to charge. And nobody makes such a cable, and if they did, I'm not sure Apple would allow it.
 

mertyz

macrumors regular
Sep 21, 2011
198
3
AFAIK, the maximum voltage iPad can output is 3.3V and the maximum current a connected device can request is 20 mA.

Do the calculation :)
 

MacBill

macrumors newbie
Dec 31, 2010
27
0
Western Montana
It would be possible, but the cable would have to incorporate a diode to prevent power flow from one direction, then it would have to be pugged in the right direction because both take the same connector.
 

olesor

macrumors newbie
Jul 21, 2011
2
0
Denmark
http://www.redmondpie.com/this-gizmo-lets-you-charge-your-iphone-using-ipad-video/

It's there, it seems. But then it's one iPhone-version too late, maybe...
 
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