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
Makita Dc 18Rc Fast Charger + Bl 1840Battery Li-Ion 4. 0Ah - - Amazon.com
Battery Adapter for Makita 18V Battery, ADP05 Power Source Charger with LED Work Light & 1 PD USB-C & 1 USB Ports, Powered by Makita Lithium-ion Battery (Tool ONLY) : Tools & Home Improvement - Amazon.com