The DLM531 is powered by two 18V batteries but can hold up to four 18V batteries providing 36V of runtime and power without leaving the 18V platform. The convenient battery selection switch allows you to quickly jump to the second set of batteries for minimal holds ups, with 4 batteries providing up to 2,300m² of runtime. The 10 stage height adjustment lets you cut at a variety of heights whilst the 70L full mesh catcher allows for efficient grass collection. DLM531 features Automatic Torque Drive technology to help power through tough grass, whilst the quiet mode drops the rpm for work in residential or shared spaces.Features: Holds 4x 18V batteries with quick battery selection switch 21” heavy duty steel deck High power brushless motor provides 2,800rpm 70L cloth catcher with grass level indicator Automatic torque drive technology