high volt (7.4v) servos?

[Urgeoner]

I need a new servo for my Muggy. I'd like to have just a single servo. I already have a hitec 5645mg in my Revo and it's alright a bit slow but no big deal. I have it powered through my Mamba Monster Esc, so I assume it gets 6v?
I would like to try a Hitec HS7954SH in the Muggy, and it has ratings at 6v and 7.4v.
Will this work if powered through the MMM ESC, or will I need a seperate dedicated 2 cell lipo?