Bosch BAT-048 battery by Amstron is designed for use with 23609 The Amstron PT-BOS21 is designed to replace OEM battery part numbers BAT-048, BAT100, BAT119. Amstron power tool batteries are precision-engineered and rigorously tested for voltage, capacity, compatibility and safety to exceed original equipment manufacturer specifications. • Chemistry: NiMH • Ratings: 9.6V 2200mAh • Dimensions (LxWxH): 3.22'' x 3.13'' x 4.37'' • Warranty: 1 Year