Here is the stock esc at tower hobbies.
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXAMN7
You referenced 7.4v which I assume would be a lipo battery and you should not hook that up to that stock esc. I used to run, on occasion, a 7cell nimh battery and that seemed to handle fine untill i started upgrading