BLACK+DECKER HPB18-OPE 18-Volt Slide Pack Battery For 18-Volt Outdoor Cor Compatible with models NST2018, NST2118, NST1810, NHT518, NS118, NPP2018, NPT318, CCS818, CCC3000, GC818. Easy to install and remove Powers your yard tools for efficient, wireless operation Weighs 1.7 pounds Includes a 2-year warranty