You can watch data, but you cannot easily export a log file to share with another tech. Want to record a 30-second run to show an erratic RPM signal? Good luck. You have to film the screen with your phone.
Modern STIHL battery tools (AP series) have complex BMS (Battery Management System) logic. DS 20 reads cell imbalance, cycle counts, and temperature histories. If a battery pack dies, you can prove if it was a manufacturing defect (warranty) or user abuse (left on a charger in a 110°F truck bed). stihl diagnostic software 20 fixed