I have a Stihl electric polesaw/weed eater/brush/… combo with a backpack battery. That battery outlasts my ability to use it in a day. Multiple small batteries is an extremely doable solution for a professional.

Also, what you add in battery charging, you easily make up with reduced maintenance of the tool.

They don't charge all that quickly and I don't think customers want people plugging in battery chargers at their homes, at least I wouldn't. All it takes is one bootleg charger from amazon, or one bootleg battery from amazon (of which there are plenty of examples) and boom nasty battery fire. I would place money on that being a magnitude more likely than a spontaneous fire from combustables in the back of a truck.

EDIT: Let's downvote instead of actually having a proper response. I can't wait until the bubble some of you live in pops and all of this nonsense goes away.