Just as an example, here's a 60" commercial mower that would meet the needs of many of the guys who work around our neighborhoods
https://www.lawnmowercornerusa.com/p...ero-turn-mower Good for 14 (call it 10 in reality) acres a day, three hour full recharge. If the technology isn't there today it's pretty darn close.
I expect you'll be seeing mowers in this category moving to larger, higher voltage battery packs. Think car batteries not power drill batteries. At least in our area the landscapers are driving $120K pickup trucks, I don't think they'll choke on a $20K mower if it makes them money.
As I mentioned before, we're already seeing adoption in the absence of any regulation. Leaf blowers and string trimmers are probably already at 50% (some towns have adopted bans on gas powered versions of those), I've seen a few of the big stand-on/ride-on electrics around town.
It wouldn't surprise me at all if, as for cars, the total cost of ownership is lower over the lifespan of an electric mower (so says the guy who just got a $1200 bill to fix his gas mower).
As to battery recycling, there are buckets of money to be made solving that problem. Lots of smart people (with big investment backing) working on recovering the relatively concentrated and valuable minerals they contain. I strongly suspect that one will solve itself. It's working profitably at pilot scale and with manufacturing waste (an easier problem), I think it's just good engineering to make it work at scale, and that's something we're generally good at. (FWIW, I'm an optimist)