I agree, it’s definitely possible: http://www.instructables.com/id/RC-Battery-Power-for-Bike-Lighting/
To be honest i can’t be bothered with all the messing around. There is too much i already have to worry about with prep and maintenance. Worrying about powermeters, computers, lights, clothing and everything else is getting a bit much. I am trying to adopt a more minimalist approach to my riding.
I am lucky enough that i live in the desert where the night sky is almost always crystal clear which allows me to use minimalist lighting effectively. My Bontrager Ion 700r should be more than enough.