Amazon.com: Upgraded to 9.0Ah 1 Pack Lithium Ion Battery Replacement for Makita 18V Battery BL1860 BL1830 BL1840 BL1850 BL1850B LXT-400 with LED Indicator Compatible with All Makita 18V Cordless Power Tools :
Waitley 18V 9.0Ah Battery for Makita Power Tool BL1830 BL1840 BL1850 BL1860 1890 18 v 18Volt 9000mAh Lithium-Ion Replacement 9A _ - AliExpress Mobile