My mom wants an electric lawn mower. Any reccomendations?

I bought an EGO on a buddies recommendation, he's the type that will spend a year researching things before he buys. Only downside I've found is the battery will charge and if left on the charger unused for several months will loose charge. I like that my boys can just go mow, no fuel to spill, oil to check, "dad, can't start the mower", etc. It's battery, mower, go!