Photo: Glenda Taylor for Bob Vila We may earn revenue from the products available on this page and participate in affiliate programs. Learn More › A battery trimmer is arguably the best tool for edging lawns, trimming around obstacles, and cutting back weeds without the noise, weight, and upkeep of gas models. To find the best options, we tested 22 battery-powered string trimmers on real yard tasks, including edging, fence-line trimming, and cutting dense growth.