There's also some serious HSE guidance about using machines with IC engines in enclosed spaces and around other personnel because of the exhaust fumes, fuel type etc. Battery powered machines do away with much of that. Some of the better machines I've used are hybrids with a small IC engine for use outside. The engine drives a generator which keeps the batteries charged. Do we have any hybrid cars like that as opposed to bolting an electric motor on the end of the crankshaft?
Koeniggegg hybrid uses one electric motor per rear wheel plus one coupled to the engine. The latter then doubles as generator. I think...