Tamiya suggests lower amp than 3300 version, maybe 4 amp top, but I don't care. I give the same: 5 amp and it's okay.
Btw, the first generation of 3600 have less punch than gp3300, some says the 3600 have higher internal resistance. So if you test your car with 3600 batt and the acceleration is lame,
probably yours is the first generation.
Mine is second generation made by yokomo, and I could not differentiate the punch between 3600 and 3300. Perhaps because I'm in stock 23T class.