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Charge an iPhone with an iPad?

M

mrcalabash

macrumors regular
Original poster
Mar 8, 2011
100
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.
 
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.
 
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 :)
 
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.
 
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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