Hitachi 18v Replacement Battery, CREJOY&trade; 18v 4.0 AH Li-ion Battery for Hitachi BCL1815 EBM1830 4000mah Lithium-Ion batteries have the best power to weight ratio Can be used with Hitachi Ni-Cad and NiMH tools Dimension: 5.9 x 5.2 x 3.9 inches || Weight: 23.92 ounce Overcharge and over discharge protection to increase the life of the battery 30 Days Money Back and 1 Year Warranty