The Makita Power Source Kit Li 18 V 4 Ah 197490-7 consists of three parts. It includes two batteries of type BL1840B and the fast charger DC18RC. The two batteries are lithium-ion batteries. These batteries have three times the cell voltage of other batteries, making them smaller or lighter at the same size. Additionally, they are significantly more powerful and suitable for longer use. The charger can also charge batteries with different capacities, provided they do not exceed a capacity of 6 Ah. Thanks to the convenient USB port, you can also connect other devices with a USB interface. The LED lights provide optimal control.