I see too many problems for this to work, at least for now.
Are the batteries proprietary or universal? I hate to have to pay a dealer for a new battery. Or find out that my brand tractor requires that brand's batteries.
Will the batteries cost $15K+? Like some of the horror stories coming from folks that bought used EVs only to find the battery was at end of life and unavailable.
If you run out of juice in the middle of a field how do you recharge or get the tractor home? Portable 50A generator? Really long cable?
Planning for a job do you know which attachments are going to suck your power down the quickest?
If you stall an attachment will it pop a breaker, blow a fuse or burn something up? Breakers get weak if "exercised" too often, and if you don't have a fuse on hand...
I can't imagine an electric motor being any smaller than my diesel (unless they go for one at each wheel) and the battery certainly must be larger than my fuel tank, so what does that do to the size of the tractor?
I store my tractor in a shipping container, now I'd have to get power run out there for charging.
I'm sure there are plenty of things I haven't considered that will only crop up once someone owns an EV tractor.