You are looking at this from the wrong angle. At least for me, i'm not looking into the most efective way to do it. I'm an electronics enthusiast and for me the pleasure of trying something out is worth more than going to a store and buy something. Of course that to do this, you have to have a...
My approach would be to just output 13,3v and connect it to the battery without the car charger. Use 5v 3A and step it up to 13,3 or 12v 1,5A respectively.
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