Well, there are many reasons but the main one is the jet engine is many times larger and more powerful.
from a distance away why does a jet sound loader than a lawn mower
The sound of a jet engine vibrates more than the sound of a lawn mower.
from a distance away why does a jet sound loader than a lawn mower
No
Depends on the brand mower the engine is installed on. More than likely any standard 12V lawn mower battery will fit.
Most of these products just varies in their power ratings. Some of the commercial ones are just way bigger and more powerful than the regular ones because they were made specifically for tougher jobs. A commercial lawn mower is much bigger than a regular riding lawn mower. A commercial lawn mower is meant for larger lawns and it generally costs more.
Many times it is better to replace a starter than to repair it unless the repairs are minor. A lawn mower engine repair manual would be the best guide. You can find one at your local public library.
Manual lawn mowers are less complicated than more modern ones. This can cut both ways. There is less stuff to go wrong, but the electronics also make the engine work more efficiently. So the electronics help it work better. A manual lawn mower will require alot more physical strenght than an electric one. A manual lawn mower is of course better for the enviorment.
Diesel trains are louder than electric trains because you the noise that the diesel engine makes, which is louder than the electric engine.
If your lawn is more than half an acre-than you might want to consider a riding lawnmower
They do go bad. Especially if there is debris under the engine cover that makes it run hotter than it is supposed to.
Fred's favored weapon was a bowling ball. He bonked someone on the head more than once.