The 6.0ah Bl1860 That Replaces Makita 18v Lithium Ion Battery Is Compatible With Makita 18v Bl1850 1840 1830 Cordless Power Tool - Rechargeable Batteries - AliExpress
Makita Battery Charger Voltage 7.2 ~18.V for BL1815/1830/1840/1850 220VAC DC18RC | eBay