Ryobi B-1815-S battery by Amstron is designed for use with CID-1802P. The Amstron PT-RYO18 is designed to replace OEM battery part number B-1815-S.. 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: 18V 2200mAh • Dimensions (LxWxH): 5.23'' x 2.87'' x 4.13'' • Warranty: 1 Year