HEVIRGO 1 Set Brushless Impact Wrench 1/2 Inch Square Drive Adjustable Speed Brushless Motor 13000 mAh Electric Wrench with 6 Socket for Makita Battery 18V 1830/1840/1850 - Walmart.com
PCB Lithium Battery Board Case Kits Set 18-20V For Makita BL1830/1840/1850 | eBay
Makita 18V LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge BL1850B - The Home Depot