Stihl AP 500 S BatteryAP 500 S Battery: Lithium Ion 337 Wh battery with STIHL connected High capacity 36 V, 8. 8 Ah Lithium Ion battery that powers tools within the STIHL AP System and is the most powerful AP battery from STIHL. With an energy capacity of 337 Wh, this battery offers the highest capacity out of all AP batteries, meaning it will consistently power AP System tools for longer. The battery has an integrated LED charge indicator, clearly displaying as and when