The STIHL AR 900 backpack battery delivers exceptional run times to professional landscapers and those with large acreage. Part of the innovative STIHL Battery KombiSystem, the AR 900 features more than 10x the capacity of the AP 80. That means up to eleven hours of run time for products like the HSA 66 hedge trimmer, increasing the size of jobs that can be tackled with maximum efficiency. The battery weighs about 15 pounds, and the comfortable shoulder straps, hip belt and chest strap distribute the weight evenly reducing operator fatigue. No more running out of power halfway through the job.