Stihl Battery Hedge Trimmer HSA 40 SetHSA 40 Cordless Hedge Trimmer with 2x AS 2 battery and AL 1 charger. The HSA 40 battery powered hedge trimmer is an extremely light hedge trimmer with excellent cutting performance, designed for smaller hedge maintenance jobs around the garden, such as trimming box hedges and maintaining annual growth. Its part of the AS System and powered by a removable lithium ion battery that can also be used in other tools in the range, such as the GTA 26 garden