Making sure your power tool is powered up every time and all the time does not only depend on having fresh and powerful batteries. If your battery charger is not up for the job you still end up screwing every screw in by hand. The everlasting search to more battery capacity makes the old chargers simply charge too slow or unable to produce enough juice to fill up your high capacity battery cells. The Nedis® replacement power tool battery chargers are 100% compatible with the original ones and are fully up to date. making sure you'll never have an empty battery again. This model is able to charge Li-ion and the slide cradle mount is designed to fit your Black & Decker/Firestorm/Dewalt batteries like a glove. Please check the compatible part number table to make sure you've got the right one.