Same brand, different battery
STIHL also sells STIHL AK and STIHL AP. We have no source saying their packs fit STIHL AS tools, so don't assume a shared brand means a shared battery.
The STIHL AS lineup
STIHL AS is STIHL's cordless battery platform. PowerToolGrid lists 8 products in it: 1 battery, 1 blower, 3 hedge trimmers and 3 other yard tools. Prices on file run from $64.99 to $119.99.