I'm in the market for a new lawnmower. I'm considering a battery powered electric mower but I'm concerned that it won't be powerful enough for the tall grass that often grows in my backyard. My yard is about a quarter of an acre. There are couple Black & Decker mowers that Consumer Reports has recommended but they also mentioned that they may not be powerful enough. And I am sure that one battery charge will not be enough to do the whole yard as I borrowed a neighbors Ryobi and it required three charges to do the whole thing. Your forums website mentions that electric mowers are only slightly better than gas powered mowers in terms of being "green". Is it worth it?