Black & Decker 40V MAX* Cordless Hard-Surface Sweeper with POWERCOMMAND, Tool Only (LSW36)

Everyone says this model is great for dry leaves on sidewalks and patios, but I'd like to know how it performs on grass. Is it just a no go?

how many miles per hour

Is this worth twice the price of the Weed Eater 20V 2 speed that also has 125 MPH air speed and also quick charging? Drive and Decks.

Does it come with a battery charger?