Electric walk-behind mowers have become popular among homeowners who don’t want to set another gas-guzzling device loose on the planet. These mowers also eliminate tune-ups and trips to the gas station.

Generally, cordless electric mowers offer easy starting, though they’re suitable only if your lawn is on the small side and you don’t cut down too much grass at a time. A corded-electric model is another choice for a small property, though consider one only if you can deal with the inconvenience of a cord and won’t have to mow too far from an outlet.

Communities in California and Ohio are promoting electric mowers in a big way, with offers of heavy discounts on Neuton cordless mowers for residents who trade in a gas mower. And now the push mower that topped our Ratings of electric models (available to subscribers), the cordless Black & Decker CMM1200, $400, our top-rated electric mower, has picked up some federal bona fides.

The Energy Star program, administered by the U.S. Department of Energy and Environmental Protection Agency, has listed the charger the 24-volt, 19-inch CMM1200 (shown) as an Energy Star-qualified device. On average, qualified battery chargers use 35 percent less energy, the program claims, than conventional models. The charger for the CMM1200’s sealed-lead-acid battery joins a list of other Energy Star chargers for cordless power tools, handheld vacuums, and a few portable printers.

In our latest review of lawn mowers, the CMM1200 proved very good at side-discharge cutting, mulching, and handling, and its wheel-height adjustment uses a single lever. Black & Decker claims the mower can handle up to one third of an acre on a single charge, but that might be pushing it—our tests revealed a 40-minute cutting time for a nine-hour charge.—Ed Perratore

Essential information: Read our recent tip of the day to get your lawn mower in shape for spring and summer cutting. And use the expert yard-care advice in our Complete Lawn & Yard Guide to keep your lawn looking its best.