Makita BL1840 18V 4.0AH Battery (Discontinued by Manufacturer) - Amazon.com
1 Set Cordless Hot Air Gun Welding Hot Air Blower Thermostatic Control Machine No Battery Compatible Makita Batteries Bl1850b Bl1840b Bl1830b Bl1430b Bl1820b Bl1850 Bl1840 Bl1440 Bl1415 Bl1815n | 90 Days Buyer Protection | Temu
Makita USA - Product Details -BL1840B-2
Waitley 18V 9.0Ah Battery for Makita Power Tool BL1830 BL1840 BL1850 BL1860 1890 18 v 18Volt 9000mAh Lithium-Ion Replacement 9A - AliExpress