Yep...Like stated... Jump packs (portable power units) are great, or simply use the aircraft! :) My bird has a 12v Socket, but I use it for the iPad at the moment, but soon it will run the GoPro too.
With regards to editing, I use a Mac running Final Cut ProX. Probably one of the best editing suites in its class. No more waiting for files to render to scrub or preview etc etc.