> I just checked the open-circuit voltage of one of my HF maintainers and > it's only 13.3, A cell is not 100% charged at 2v/cell, the real value is 2.25 to 2.27V/cell or 13.5-13.62V for a 12v (6 cell) battery See http://www.batteryuniversity.com/partone-13.htm Padgett