I think it would be tricky and would create more purpose-specific equipment to buy. Fields are big, like sometimes really big, definitionally remote, and electr

I think it would be tricky and would create more purpose-specific equipment to buy. Fields are big, like sometimes really big, definitionally remote, and electrical transmission losses are real at "normal" voltages with fieldscale lengths. And crucially, the weight of batteries is actually a benefit for a tractor: the heavier you are, the more you can pull and cantilever. Without them, you'll still be dragging around 5000 pounds of steel ballast to hit a useful weight on your tethered tractor. Batteries can also serve as remote power banks (electric PTO) miles from any electrical supply, just as regular PTO driven tools use the mechanical energy from the engine to do other work besides toodling and pulling anywhere on the farm. I mean, I'm open to it. Batteries are expensive-- most of the cost of a tractor conversion. Go build a prototype that competes on cost and I'll cheer from the sidelines and maybe buy one if I can afford it.