While I like the environmental aspect of using an electric lawnmower
(presumably the fuel they burned producing the electricity that recharged the
battery was cleaner, or better yet hydro-power), I haven't found one that has
the 'grunt' of a decent gas powered mower.

I have better than a half acre to mow, and anything less than my 6 horse Ariens
just doesn't do the job.

Has anyone had experience with a cordless electric mower that has the grunt and
battery capacity (2 hours or so) to replace the gas models?