I have an old incandescent 3 D cell Maglite that doesn't get much use. I did upgrade to the genuine Maglite LED sometime back and although it was an improvement, it is rather unimpressive by today's standards. Anyway, I had been looking at the TerraLUX MiniStar31M-EX sort of hoping that my Maglite was a 4 D cell, but then I got to wondering if I could use 4 C cells in my 3 D Maglite with the TerraLUX MiniStar31M-EX?