Amazon.com : ARyee 2Pack Upgrade 18V 5.0Ah Li-ion Battery Replacement for Makita Lithium-Ion Battery Compatible with Makita BL1840 BL1850 LXT-400 BL1860 BL1815 BL1830 : Tools & Home Improvement
Amazon.com: Battery Adapter Compatible with Makita 18 Volt NiCad & NiMh Cordless Power Tools, Converter for Convert Makita BL1830 BL1850 BL1860 BL1840 18V Lithium-Ion Battery to Makita 18V Ni-Cd/Ni-Mh Battery : Tools
Amazon.com: MechanicAnts MA21007 Lithium-Ion 20V MAX 4.0Ah Battery for All Power Tools, Compatible with Makita BL1840 : Tools & Home Improvement
18V 9.0ah Bl1890 Replacement Battery Compatible with Makita Bl1830 Bl1840 Bl1850 Bl1860 Bl1890 Lxt Li-ion Battery Tools with LED Indicator - China Lithium Battery and Lithium Ion Battery