Mamba max Vs 9920, Your vote.

WTF, there: http://www.castlecreations.com/products/mamba_max.html read can use ONLY 12 NiCad/NiMH cell, or 2-3s LiPo, is that true or not? Many guys in here use more than 12 NiCad/NiMH or 2-3s LiPos, what is point in this thing? Why there: http://www.castlecreations.com/products/mamba_max.html read can use only 12 NiCad/NiMH cells or 2-3s LiPos, if can use more??? I cant understand... Im gone crazy... Here in Finland anyone dont use more celss with MM... LOL !