The thoughtfully designed Makita Power Source Kit Li 18V 4Ah includes 2 lithium-ion batteries. When one battery is depleted, simply connect the second battery to your Makita power tool to continue working. Use the Power Source Kit Li 18V 4Ah as a power source for your Makita power tools. The Makita batteries are compatible with many Makita cordless devices. With battery-powered tools, you can work without the hassle of cords and independently from power sources. This allows for greater flexibility, such as when trimming hedges or mowing the lawn. Additionally, you can avoid the unpleasant smell of gasoline.