MM input voltage.

[BrianG]

Actually, 3s lipo is as high as 12.6v (4.2v/cell), but that's beside the point.

That 13.95v on 9 cells is 1.55v/cell. But I bet if you let the cells sit for a little bit, they'll drop to something around 12.5v (~1.4v/cell), and even then, the cells don't stay there very long when you start running. Even at 1.4v/cell (typical "peak" voltage for NiMHs), a 12 cell pack will be around 16.8v (which, incidentally, is the same max voltage for 4s lipo). You should be perfectly fine. The components on the MM are rated for at least 25v, but some of that is for a little "headroom".

You may have trouble if you decide to try 14 cells, but even then the MM would simple not arm (won't blow anything).