Dennis, as long as it's starting well, I wouldn't get too concerned. Really, I'd rather see a little more time at a heavy charge than one which recovers quickly, because the really quick recovery might indicate a "sulfated" battery which has very little reserve. Some batteries will work fine for a start or two, and then fail to start the engine under a flooded condition, or whenever several seconds of cranking are required. Watch the water level, if possible, and if one cell starts to need more water added than the others, that one's got a problem.
P.S.: Betcha you couldn't tell I teach Auto Mechanics in a high school!
Jerry
