Back to racing after 12 years, Batteries!!

[SiTrace]

When I last raced, we all used 2300 nimh and had a battery pack per heat!! and a few spares!

Now starting up again, how many battery packs will I need for competative day of racing, I will buy top grade Lipo's Orion carbon or something simular, realistically how many packs will I need to buy for a days racing in one class? can lipos be run in more than one heat?