Battery-powered weed eaters’ function like Gas-powered or electric-powered ones. The only difference is they take power from a battery.nnThe battery can be a lithium-ion battery or any other type of battery. In a weed eater, there is a head that spins at high RPM.nnThe cutting head comes with two-line ports which feed the weed into the cutting line for the head to cut it.nnSome weed eaters come with dual cutting line and edge functionality, and some with a single line.