hi, my charger has a cutoff voltage of 4.08V at 18650 Sony VTC4´s LiMn and at Samsung Li-Ion, too. This might not be correct. I also own the old version of this charger (Intellicharger I2) and that one has a cutoff voltage of correct 4,20V. For me this means that I can´t make a use of the full capacity of my cells. Hope to get answer from fasttech staff soon.