As per title
24awg, for shorter lengths, supports like 3.5amps for chassis wiring (not sure what do they mean by chassis wiring)
To me, chassis wiring is enclosed wiring - can't lose heat the way it can in the open air. This may, or may not, have anything to do with the real definition.
the batteries are 5000mah i have used thiner wire but i was only getting 2.2amp at the tail i just tried 18 awg but thats a bit thick at the led end..
i also have some 20 awg