My mom wants an electric lawn mower. Any reccomendations?

My wife bought a Kobalt about a year ago. She loves it. It's light and the big back wheels helps her maneuver easily. We had .80 acre in Georgia and the battery would cut about 75% of it on one charge. Now we have. 33 acre and it cuts the entire yard.

Since we're on flat land now, it might be time for a robot, lol.