Mostly club and regional racing you will be topping up between rounds, you should get half an hour at least to put back in what you took out in 5 minutes, if its a 5500 or 3500, you will use much the same racing, 5500 may have more punch, depending on the output C number.
I don't think a 5500 battery will make much difference to charger or charge times, topped up at 5 amps may take 10% longer (than 5.5amps), that may be 5min.
You can pull them off 90% charged and still run a race.
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