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Make sure what ever adapter you use in the cig lighter, it must be separately fused. I had a friend who her car caught fire when the wires going to the phone shorted. The fuse for the lighter socket is way to big for protection and you need to have one in the adapter or on the cord.
 
iPads generally require higher voltage, don’t think that cigarette lighters provide enough voltage to charge it fast.
 
Ah, crap I mis-read this post and didn't see the fast-charge. I retract my statement.
 
If your car has a power outlet like mine, then yeah ;)

I would think the cigarette light port (or whatever its called just doesn't draw enough power to do a fast charge.

Capto_Capture 2017-11-17_06-31-26_AM.jpg
 
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