fishing light question

I have a couple of 12v battery booster pacs. They're several years old, but still have enough ump to jump-start a car. Would these work to power an underwater crappie light? If so, what size light should I get?

Should be good for led lights.

Buy a 16' roll of waterproof 5630 LED lights off of eBay or Amazon and wrap it around some 2" PVC pipe. Seal it with some clear Flex Coat and you'll have one of the brightest submersible lights around. I did 32' on my submersible and it is stupid bright.