11BGA 85
5. Testing the Battery
– Before starting the test 
procedure, make sure the 
malfunction is not being caused 
by the blower wheel. Always 
check its freedom of movement 
first. 
Do not start the machine if the 
blower wheel is stiff or jammed – 
this may cause the motor and 
battery to overheat and be 
damaged.
The battery is sealed (arrow) when 
it leaves the factory.  Never attempt 
to open or repair the battery.
3901RA170 TG
5.1 Acceptance
Always carry out a visual inspection 
first.
: Check the contacts (arrows)
If there are signs of external 
damage (e.g. bent or damaged 
contacts, deformation, cracks in 
housing), always install a new 
battery. 
3901RA171 TG
5.2 Testing with ADG 1 
Battery Analyzer
Never open or repair a battery. 
Always replace a faulty battery. 
– Test the battery with the STIHL 
ADG 1 battery analyzer, see 
separate instruction manual for 
ADG 1.
– Observe the information in the 
instruction manual. 
– Observe safety precautions, 
b 2.
3901RA184 TG