Hey there and welcome to RCU. Just a few more thoughts, a 10cc engine is also referred to a .61ci (that ci stands for cubic inch this whole class of engines are sometimes just called sixtys. Look on the left side of the cylinder for any letters, symbols or names and on the right side just below the exhaust.

You mentioned an ESC but they are not used on airplanes with glow engines and in most installations there is only only one battery used and that functions through a switch to power the receiver and the receiver in turn sends power to the servos which activate the controls.

It would be helpful if you would indicate what country you are in so accurate info on how to get help could be given.

John