I made up a few battery boxes to help power my led lights in my shanty as well as keep power to electronics. I got some 12v 7.2 amp batteries just like the ones in the flashers from the place where I work. They were emergency light batteries that were being replaced but still functional. Got boxes at harbor freight for $5 and used old Christmas tree light outlets along with a USB port. I have another box that has outlet, USB and cigarette plug. Push buttons from radio shack for $1. USB & cig port from amazon for $4 or so as well. all in about $12 each. Works pretty well. Ill try to add an image or two