Battery and motor system for replacing internal combustion engine

A machine configured to be driven by an internal combustion engine, the machine comprising:

• an output member configured to rotate about an axis;
• an interface configured to receive an internal combustion engine to rotate the output member, the internal combustion engine having a maximum motor speed;
• a motor system configured to couple to the interface in place of the internal combustion engine, the motor system including
• an electric motor having a maximum motor speed that is greater than the maximum engine speed;
• a battery configured to power the electric motor;
• and
• control electronics configured to control current delivered from the battery to the motor by delivering reduced current to the motor when the motor speed is less than a low motor speed threshold, delivering high current when the motor speed is between the low motor speed threshold and an intermediate speed threshold that is greater than the low speed threshold, delivering reduced current to the motor when the motor speed is between an intermediate motor speed threshold and a high motor speed threshold that corresponds the maximum engine speed.