Battery specifications Battery voltage: 21V Battery capacity: 2000mAh Increase battery running time by 100% Suitable for 18V Makita batteries √ Compatible with 18V B series lithium batteries, such as BL1850B (197285-8), BL1840B (197270-1), BL1830B (197602-2), BL1430B (197618-7), BL1820B (197487-6); √ Compatible with BL1850, BL1840, BL1440 (196391-6), BL1415 (194560-3), BL1815N (196781-3); × Incompatible with G-series batteries, such as BL1813G (196663-9) BL1413G (196882-7) BL141