You are showing a fair bit of Ignorance there, GON. First thing to GO with a Roo is usually the radiator. Batteries DON'T fall Out and catch fire either. Get with the technology. There's NO corded Power tools these days. An electric motor is near 100% efficient with practically no maintenance. No Dirty oil, No corrosive exhaust system, clutch, Gearbox, Fuel to be contaminated. No need for any tune ups.Nev