Amazon.com: Heshunchang Battery 18V 4Ah Replace for Makita BL1811G BL1815G BL1813G BL1820G 195608-4 : Tools & Home Improvement
Amazon.com: MechanicAnts MA21007 Lithium-Ion 20V MAX 4.0Ah Battery for All MechanicAnts Power Tools, Compatible with Makita BL1840 : Tools & Home Improvement