Makita 40V Max XGT Brushless Rear Handle 10-1/4 in. Circular Saw Kit, AWS Capable (4.0Ah) with bonus 40V Max XGT 4.0Ah Battery GSR02M1-BL4040 - The Home Depot
Makita BL1840B 18V LXT Lithium-Ion 4.0Ah Battery, Black - Amazon.com
Adapter (adapter) for Makita cxt tool 10,8-12V - AliExpress