The compact, lightweight AK 10 battery weighs in at 1.8 lbs., featuring an updated battery face design with the same exceptional power as the previous model. Ideal for select AK System tools, the AK 10 battery provides optimal run times for the FSA 57, HSA 50, and HSA 56, providing full power over the entire run time. The LED light display lets you know the status of your battery’s charge. Enjoy clean-running power and performance with the STIHL AK 10 battery. View Our Usage Chart, Available at your Dealer