I've seen them all... and no body.. and I mean no body has beat Jeffs box (post 334 pg 12) go to his link!. He also has a great idea of buying a jump starter and dismantling it into it's basic components. There are several on the market and range from $30.00 on up. You get: a high amp (15-18amp hours) 12V sealed battery, heavy duty on off switch, led lights, cig. lighter adapter, wall charger, and some have a volt meter and air compressor. If you bought all this stuff at the hardware and hobby shop separately it would cost considerably more money. Plus he has the "fuel cell" problem solved.

Kudos to you Jeff.

SkyBound