I have a brushless 'Remington' brand donor chainsaw. The motor is 24,000 rpm at 40 volts. 1200watts, There is a 4 to 1 gear reduction attached to the motor with a nice collection of mounting holes all over the unit. I am in the process of attaching the power output shaft to the worm gear reduction from a skill model 77 'skillsaw'.. that gives me another 5 to 1 reduction and a 90 degree change of rotation. I get to use the saw blade attachment system to mount the small sprocket (then the chain ..then to a bigger sprocket on the other side of the bike rear hub. Batteries are not a problem. It will take me a while to get it together but I am having fun with it now.