The makita dtw450rfe 18v impact wrench is powerful yet compact and lightweight this cordless impact wrench is powered by an 18v 30ah li ion battery there is a rubber joint construction for minimum battery failure and the lithium ion batteries have a greater life span than ni mh or ni cad counterparts giving you 430 greater run time lithium ion39s 40 weight saving means 18 volt power can be obtained by a battery that weighs the same as a 12 volt ni mh battery the dtw450rfe is run by a