Earlier quoted context omitted.
A lawn service that is working 8-10 hours a day can't use battery tools unless they buy a lot of batteries and/or have a way to recharge them in the field (from a gasoline-powered generator, most likely). So their complaint has some validity.
BS. Gasoline is just more convenient and cheaper for them. 40V batteries last long enough that you only need a handful of them to last a whole day.
BTW "more convenient and cheaper" are strong arguments when you're in a competitive business. Lawn services are usually just a guy with a truck hustling for customers. The more lawns you can cut the more money you make. Anything that causes downtime such as running out of charged batteries is going to be a large negative.