2Pack BL1840B 4.0Ah 18V Replacement Battery for Makita 18v Battery Lithium Compatible with Makita 18 Volt Battery BL1815 BL1820 BL1830 BL1840 BL1850 - - Amazon.com
Amazon.com: MechanicAnts MA21007 Lithium-Ion 20V MAX 4.0Ah Battery for All MechanicAnts Power Tools, Compatible with Makita BL1840 : Tools & Home Improvement
Makita BL1041B 12V max CXT Lithium-Ion 4.0Ah Battery, Black - - Amazon.com
Amazon.com: 2 Packs 18V 6.0Ah BL1860B Battery Replacement for Makita 18v Battery Lithium BL1815 BL1820 BL1830 BL1840 BL1850 LXT-400 Cordless Power Tools Batteries with LED Indicator : Tools & Home Improvement
Amazon.com : 2Packs Upgraded 6.0Ah 18V BL1860B Replacement Lithium-ion Battery Compatible with Makita 18 Volt Battery with LED Indicator BL1860 BL1850 BL1840 BL1820 BL1815B LXT400 Cordless Power Tools : Tools & Home
Amazon.com : 2Packs Upgraded 6.0Ah 18V BL1860B Replacement Lithium-ion Battery Compatible with Makita 18 Volt Battery with LED Indicator BL1860 BL1850 BL1840 BL1820 BL1815B LXT400 Cordless Power Tools : Tools & Home