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No alt = yellow. W/ alt, use red.
I use one yellow Optima, no alt, no problem. 440, 12.5:1, small Chrysler starter, two classes each day, use a Black & Decker smart charger.
Brian

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Just curious, do you have to charge between rounds?

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Yes, I charge between rounds, at least the early rounds. If I'm still in both classes late, I don't have enough time to charge much. I have actually done this several times, come back from a run, back into my pit, hook up charger, fuel the car, unhook the charger and go back to the lanes. In about the time it took to say it...
Brian