The 400-gram lightweight battery BP 18 Li 3.0 C is ideal for drilling and screwing in all assembly work. Together with the brushless EC-TEC motors in Festool's cordless drills C 18, T 18+3, the impact drill/screwdriver TID 18 or the screw driver DWC 18, it provides sufficient power and operating time while making the tool very easy to handle. Of course, it is also fully covered by Festool Service. In short: The ideal battery for drilling and screwing in installations.