“I used one and it was pathetic for my green lawn outside It moved much too slow.”
My former gas mower moved too slow for me. What model did you use.
Like gas moweres they come in different flavors. I am sure that there are gas mowers out there that would not meet your needs.
Mine is 80v and came with two batteries. Works fine on a residential lawn even when overgrown.
I have a 166cc or so Troy Bilt. What is your electric lawnmower?