Hey, i was at the field the other day, when i saw what one of the members was using for power other than a battery.
This might not be a new idea, but i thought i would share.
Its one of those motomaster power packs. They guy modified it so it can plug into his power panel. It can be charged by pluging into a wall and is rated for 300amps. I have noticed regular hobby batteries arent quite as strong, and 12v car type batteries are heavy and a PITA to lug around. Im thinking of going this route once i get the money to buy them. he said he bought his for about $40 on sale.