An internal combustion engine (1000) includes an engine block (1002) including a cylinder (1004) a piston (1006) positioned within the cylinder (1004) a crankshaft (1008) configured to be driven by the piston (1006) a fuel system (1001) for supplying an air-fuel mixture to the cylinder (1004) a starter motor (1014) and a lithium-ion battery (1020) mounted on the engine, the lithium-ion battery (1020) configured to power the starter motor (1014) to start the engine (1000).
