so I have a solar backpack that can charge a macbook and would like to use it to charge my surface pro. the problem is, I emailed the backpack maker to see if they had plans to release a surface pro cable and of course they aren't planning one. the tech said it was possible to get one of their notebook cables and solder to a surface pro tip. so my plan is to buy a laptop cable from them to get the right connection to the pack's battery, and a new surface pro charger to get the right connection to the pro. thing is, I'm not much the soldering type. does this sound doable? I know it's a bit of effort for a charging cable but it would be really trick to be able to feed the pro a little extra juice at school or at the airports when traveling. is anyone willing to help?? I can post some pics of the macbook cable and the backpack's battery. would be a cool little project.