I think that until they figure out how to make large mowers that employ lithium-ion batteries rather than lead acid batteries that don't cost a fortune, then electric cordless mowers will not be practical for professional use. Lithium-ion batteries are smaller, lighter and recharge much quicker than lead acid batteries, and have a longer charge cycle life. I have a Greenworks 40V 16" lithium-ion battery powered push mower that will run about 45 minutes on a full charge, which is sufficient time for me to mow my 6500 sq ft property. Something like this might be useful for a pro as a detailing and trimming mower, as it can get into much tighter spaces that a full size gas mower. Since it weighs only 38 pounds and has a top carry handle, I can easily lift it over ledges and use it in tight areas, rather than hacking away with a trimmer. The battery weighs only 3 pounds and can be charged off the mower in about 2 hours when fully discharged. It also interchanges with other Greenworks tools, such as a trimmer, blower and 12" chain saw.