I was wondering about charging my optima blue battery between rounds on high charge, so I called Optima directly to get answers. They said, charge it as fast as you want, but don't let the battery exceed 125 degrees. Obviously that must be the point they boil out the liquid? I have been pulling back into the pits and putting the charger on "start" for years, but really can't say how much I have gotten away with. Only that this didn't destroy the battery for the passes I made. Battery life seemed to be good, but again, no records to show just how much I put it through.