Update on my problem. New cell arrived. Turned on old cell for one last reading. It was 2500. Put in new cell and it said 3600. Obviously, my FC problems are gone (at least for now). One thing I did notice, though is my control box gets awfully hot on the top. It may have done this all along, but I sure didn't think it got quite that hot. Anyone notice a new cell making their's get hotter than before? Just curious.