Amazon.com: [Upgraded to 9.0Ah] 18 Volt 9000mAh BL1890B Battery Compatible with Makita 18V Battery Lithium-Ion BL1890 BL1860 BL1830 BL1840 BL1850 BL1850B Cordless Power Tools with LED Indicator(black white) : Tools & Home
Amazon.com: SUnMilY for Makita 18v Battery, 6.0Ah Replacement Lithium Batteries Compatible with Makita Battery 18V BL1860 BL1850 BL1850B BL1840 BL1840B BL1830 BL1830B BL1815B (4 Pack) : Tools & Home Improvement