my 7 cell 3000 mah has one cell that runs about 203 degrees after 10 minutes of hard running, the other cells are at about 150 or 160, do I have a bad cell? can I replaace the cell or is there anything I can do to recover that cell? the car runs but not at a pace the other battery brings but it will run the car for abot 10 or 12 minutes ran full throttle. help please!