[mman1506]

We used a deep cycle boat battery attached to an inverter last year. We also used it to charge frc batteries while moving. A deep cycle will last much longer than a car battery as they are built to be discharge fully and recharged unlike a car battery which is being topped up by an alternator.

It was approved but we were told that we had to make an enclosure for the battery to help prevent shorts and spills. We encased it in a vented MDF enclosure (not the safest thing but it did the job). We lugged it around in on our cart during queue and then it was carried by our driver to the station. It was super heavy but we only charged it once or twice a season.

This year we're using a 11.1v 60AH lithium battery I made myself from recycled makita packs which is muuuch lighter and 1/2 the size but about 1/2 the capacity and a bit more expensive. It can be brought on a plane if you tape the contacts and you seal it in a bag.