A sander without battery is a smart choice if you already have a matching battery. For example, if you already have an 18V sheet sander, but you expand your tool collection with an 18V delta sander of the same brand. This not only saves you money, but also space in your shed or van. You can also use the Bosch 18V battery on your delta sander or on a Bosch eccentric sander, which is useful. When purchasing a bare tool, keep in mind that the battery you have at home needs to be of the same brand, with the same voltage, and belongs to the same battery platform.