KATSU FIT-BAT Cordless Tools Range they all take the same battery, works on both 18V or 21V, compatible with LXT range, use your current or easy to find on amazon (compatible with BL1850 BL1860B BL1855 BL1840 BL1830 LXT-400 BL1820B BL1815). With brushless motor, the battery lasts almost twice longer than normal brushed motors, in addition it is maintenance free. Comes with 3.0Ah battery and charger, packed in plastic case. Brushless Cordless Die Grinder features with 6 step variable speed up to 11000rpm for different application. 6mm Collet capacity, control switch with lock on, compact barrel grip, allows for comfortable long use for all types of jobs. Multifunction Rotary Tool: By matching different rotary tool accessories, the power die grinder can use in sharpening, grinding, cleaning, polishing, cutting, engraving, drilling and trimming. Great for woodworking, metalworking, jewellery cleaning/polishing, hobby, Around-the-House, workshop, jobsite and DIY crafting projects. Specification: Material: Plastic and Aluminum Cordless Tool Type: Die Grinder Power Supply: Rechargeable Li-ion Battery Voltage: DC 21V Motor Type: Brushless Motor Rated Input Power: 140W No- load Speed: 0-11000rpm, 6 Speeds Control Collet Size: 6mm Total Length: 31cm Comes with 3.0Ah battery and charger, packed in plastic case. Ideal for finishing dies, press work, die casting and molding and grinding of machine parts. Maximum no-load speed in six gears: Speed setting 1: 2000 rpmSpeed setting 2: 3200 rpmSpeed setting 3: 5600 rpmSpeed setting 4: 6300 rpmSpeed setting 5: 8200 rpmSpeed setting 6: 11000 rpm Please forgive the fluctuation of measurement results caused by different measurement methods and measurement tools. The above values are for reference only.