you need a leisure battery. not a normal 12v car battery. Best place to get them are caravan dealers.
Leisure batteries are designed to give out the power differently to normal car batteries. If you charge from a normal 12v it will die after a few months.
If you plan to do full weekend racing then you probably need one around 90a or higher. If it's just for club nights then a 60a would probably be ok.
Avoid the halfords ones, quite expensive. You will also need a proper charger for it.
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