My E-Revo questions and build

[j-man]

After cruising around with 12 cells, I moved to 7 cell packs, IB4200's. I've been testing them for a while now, on loose dirt, packed dirt, grass, and pavemet.
No matter what I do, the MM esc does not get varm, just slightly over body temps, batteries are a bit warm and motor 2 sec touchable.

More voltage? Does MM handle 15-16 cells, thats almost as much as 5s lipo, and I understand some problems with MM handling it? Or would the fact that nimh gives less amps help MM to handle it?