In the late 60's - early 70's we had a Sunbeam electric mower like the one in Wiskybill's post. We used it for several years, and I think the motor eventually burned out.
About 15 years ago I bought a Black & Decker cordless mower. I liked it, but it didn't have enough power to do the entire yard in one day. It's battery finally went bad, and was going to be very expensive to replace. It's still sitting out in the shed. I replaced it with a John Deere push mower, which is tops. Doubt I'd ever go back to any type of electric mower as long as I have a big yard.