batteries
 

does any one know where i can get some good reasonably priced a123s and how many a123 cells can my mm esc handle

Kulangflow had some for sale recently, PM him.

The Mambamax can handle 4s lipo, so 5s of A123 is do-able- might need to drop the charge level a little (3.6 instead of 3.65v etc) to get it to arm.