Geezzee, glad I asked. Its a Castle Creation Thunderbird 54. On the ESC there is a little note 12C MAX. No further details anywhere....I thought it was refering to the input from the Batteries?. Also it clearly states everywhere that it will not handle anything over a 3 cell Lipo which is fine and thats what i planned on using. Your saying that the 12C could mean something other than Input capacity.? I thought all I had to worry about was exceeding the 54 amps. Ya Learn Sumtin New everyday!!!!