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. Powerful motor runs with 3000-8500rpm
Rubber soft grip coated handle, takes 115mm and 125mm blades.
Three speeds controller switch achieves fast and efficient cutting grinding.
Without Batteries or charger
No-load speed: 3000-8500rpm
Spindle thread: M14
Blade diameter 115/125mm
Fits Makita's 21V/18V batteries