The Greenworks 24v Li-ion System is a range of 24v tools where all 24v batteries of all ah ratings fit all tools, allowing you to buy just a few batteries but as many of the range of bare tools that you need without the expense of a new batteries and chargers each time. In some cases there may be tools that take 2 x 24v batteries to power a 48v motor - These are still part of the 24v battery system but with the added benefit of a more powerful motor.