The Black & Decker LST136 Straight Shaft String Trimmer features the 40V Lithium Battery System that holds a charge up to 5x longer when idle and offers longer life year after year when compared to the HPB18 Black and Decker Ni-Cad battery packs. Releasing zero emissions in your yard, this string trimmer also features the exclusive Power Command System, which lets you adjust the motor power up or down for specific cutting needs. This trimmer also features a lightweight design (7.08 lbs.), edger conversion and bump-free use. Choose MAX power to tackle thick weeds, MAX runtime to increase battery life or a combination of both.