Stihl AR 2000 Lithium-Ion Backpack Battery AR 2000 Backpack Battery Now, you don’t need to carry multiple batteries for those large outdoor projects. The STIHL AR 2000 backpack battery delivers exceptional run times to professional landscapers and those with large acreage. Weight: 15.7 lbs. Battery Power: 891 Wh Rated Voltage: 36 v Product Your Name (required) Phone Number (required) Email Street Address City State Comments *Reservation subject to availability. Someone from Crescent Avenue Gardens will be in touch shortly to confirm this product is available.