I suppose my answer would be that batteries are big, heavy, and very expensive, and you'll never avoid having very limited run time under load and long recharge times (see the
Soletrac specs for example).
So the target market for gas is only: as a somewhat less desirable replacement for diesel, haha. But if diesel fuel costs remain stratospheric, and emissions regulations continue to tighten and choke the diesel engine further into inefficiency, then the gasoline alternative in the 25-50 HP CUT market could start to look workable.