HQRP 18V Battery for DEWALT DC390 DC390B DC390K DC390KA DC390KB DC390N Circular Saw + Coaster HQRP&reg; Replacement Battery plus HQRP&reg; Coaster; Battery Voltage: 18V; Capacity: 1.8Ah; Ni-Cd; Compatible with Original Battery; 200 Days warranty!