Many moons ago when I used to camping with the Venture Scouts, we used to have a portable music player which was simply a large rectangular box with a hinged lid. Inside was a Car Battery and Car Radio / Cassette player, with two speakers mounted in the side. Not only did a fully charged car battery last us all weekend, but it was a useful seat as well!
Now I'm camping with the family I'd like to have something similar but nothing near as heavy to carry and as bulky to store. Is it possible to build something with a smaller battery, say a Motorbike battery? That could be charged with my standard Halford Car Charger before trips? Would that work?
Perhaps it time for me to go back to basic no facility sites,get used to using a portable toilet again manage without my luxury's that dont have any effect on other campers.