http://www.cleverscampcamp.com/portable-camping-saws/
Recommendations for a portable power source?
I saw a TV ad for these not too long ago bu silly me I forgot to write down what they are called so now that I need one I can’t for the life of me find one. 
Anyway, it’s basically a large rechargeable battery that can be charged either at home or via a car and is often used for camping. As a crafter who does a lot of shows I sometimes end up in places where I don’t have access to an outlet and need something that can quietly power my mp3 player, a pair of decent sized portable speakers, and two or three floor lamps for about 5 hours.
What they are called, as well as brand and size recommendations would be greatly appreciated.
Thanks!
Duracell makes portable power packs that are rechargable, and do 12 or 120 volt. Try this site .. www.duracellpower.com/portablepower
Emptying a portable loo with a hangover