Get the high performance of STIHL in a battery. Part of the STIHL AK Series, the AK 20 is a Lithium-Ion, 36-volt battery that delivers a great power-to-weight ratio. The AK 20 weighs only 2.7 lbs. and is great for applications where more run time is needed. STIHL batteries are engineered to run the power tool at full speed until they are completely depleted, as well as minimal loss of charge during storage. Indicator lights show the battery level of charge, so you can plan your productivity accordingly. Inside the battery, sensors monitor temperature and automatically shut down if the battery ever becomes too warm or cold. Check out this and other STIHL batteries at our Dealership today! Run time may vary based charge level and operating style.