Now you don’t need to carry multiple batteries for large outdoor projects. The STIHL AR 2000 backpack battery delivers exceptional run times to professional landscapers and those with large acreage. Part of our innovative system of STIHL battery-powered equipment, the AR 2000 delivers exceptional run times – up to 11 hours with the HSA 66 hedge trimmer. It’s also smart, with built-in sensors and microprocessors that monitor temperature and automatically shut down the battery if it overheats. The backpack battery is also designed with comfort in mind, including an ergonomic hip belt and chest strap that evenly distributes its weight. And in light rain, use the included removable rain cover to keep powering through the task at hand.