[SC321X]

I have 2 red top Optima batteries in my dragster. I use a black and decker charger that will run 40 amps continuous and will keep up with the fan and water pump between rounds. It will gradually go down to 0 charge when fully charged. my dragster is an 2008 and I changed out my old optimas last year just because I figured it was time, but they were still working great. I hope this helps. I tried the S brand and they didn't keep up.
Dave D. SC 321X