If batteries are getting so cheap why isn’t anyone making battery powered: chainsaws, full size vacuum cleaners, jet skis, ride on mowers? All of those would be revolutionary.
They are. The fire department I volunteer at has put the dewalt battery powered chainsaw in service on our engines (which is significant as we deal with a lot of downed trees, etc.)
I am personally (slowly) switching to battery operated tools for lighter duty mowing and trimming at my ranch (dewalt and bosch).
Further, I see that while the big brands (Polaris, Kawasaki, Yamaha) do not yet have electric quads, you can find them on alibaba, etc., to be shipped to the US.
Heavier duty use-cased - like very large chainsaws and mowers - will still have people like me using IC engines but regular homeowners and even contractors/pros will be switched over to battery for almost everything landscaping/mowing related in the next ten years. It couldn't happen too soon.