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 :
Makita 18V 5.0Ah LXT Lithium-Ion Power Tool Battery, BL1850B at Tractor Supply Co.
Amazon.com : TENMOER 18V 9.0Ah BL1890 Replacement Battery Compatible with Makita 18V BL1830B BL1860B Cordless Drill with LED Screen Display,2-Pack : Tools & Home Improvement