Black decker cordless grass trimmers black decker glc3630l20 gb p this cordless grass trimmer from black decker offers a high torque gear system powered by a lithium battery which ensures a faster more efficient cut this versatile tool is effectively two tools in one as it converts easily from trimming to edging you can also choose between maximum run time eco mode or power mode turbo for when the going really gets tough p p a telescopic tube means the glc3630l20 will suit gardener