The Home For Makita LXT 36V  @ Buyaparcel 

The Makita 36V range is a select collection of machines that require two of the 18V LXT batteries that drive a 36V DC motor.

These tools deliver more power along with longer run times and enhanced performance levels.

Please note If you use two batteries with different capacities are used, such as a 4.0Ah and a 3.0Ah, the machine will stop when the battery with the least capacity is fully drained.
This is the same case with two batteries of the same capacity at different charge levels.

Makita's twin 18/36v machines deliver more power and runtime without leaving the 18v Lithium-Ion platform. 2x 18v Batteries will power the 36v DC motor.
When different capacity batteries are used together (for example, 4.0Ah BL1840 and 3.0Ah BL1830, or fully charged BL1830 and 70% charged BL1830), the machine stops when the battery with less capacity is empty.