Makita 18V LXT Lithium-Ion High Capacity Battery Pack 4.0Ah with LED Charge Level Indicator (2-Pack) BL1840B-2 - The Home Depot
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 :
Lithium Ion Battery Circuit Board for Makita BL1830(18V 1.5Ah/3.0Ah/6Ah) : Electronics - Amazon.com