Condition
LEDs on Bat‐
tery
Cause
Remedy
► If 3 LEDs continue to flash red: Do not
use your trimmer and contact your
STIHL dealer for assistance.
3 LEDs glow
red.
Trimmer is too hot.
► Remove the battery.
► Allow trimmer to cool down.
4 LEDs flash
red
There is a malfunction
in the battery.
► Remove battery and insert it again.
► Switch on the trimmer.
► If 4 LEDs continue to flash red: Do not
use the battery and contact your STIHL
dealer for assistance.
No electrical contact
between trimmer and
battery.
► Remove the battery.
► Clean contacts in battery compartment.
► Fit the battery.
Trimmer or battery
damp.
► Allow trimmer or battery to dry.
Trimmer cuts out
during operation.
3 LEDs glow
red.
Trimmer is too hot.
► Remove the battery.
► Allow trimmer to cool down.
There is a electrical
malfunction.
► Remove battery and insert it again.
► Switch on the trimmer.
Trimmer runtime
is too short.
Battery not fully char‐
ged.
► Fully charge the battery.
Normal battery life
has been exceeded.
► Replace the battery.
Mowing head
cannot be
unscrewed by
hand.
Mowing head over‐
tightened.
► Block the fanwheel with the stop pin.
► Unscrew mowing head by hand.
► Remove stop pin.
Charge process
does not start
when battery is
inserted in the
charger.
1 LED glows
red.
Battery too hot or too
cold.
► Leave battery in the charger.
Charge process starts automatically as
soon as permissible temperature range
is reached.
19.2
Troubleshooting Charger
Condition
LED on Char‐
ger
Cause
Remedy
Battery not being
charged.
LED flashes
red.
No electrical contact
between charger and
battery.
► Remove the battery.
► Clean contacts on charger.
► Fit the battery.
Malfunction in char‐
ger.
► Do not use the charger and contact your
STIHL servicing dealer.
20 Specifications
20.1
STIHL FSA 57 Trimmer
–
Approved battery: STIHL AK
–
Weight without battery, cutting attachment and
deflector: 2,4 kg
–
Length without cutting attachment: 1490 mm
up to 1690 mm
For battery life see www.stihl.com/battery-life.
20.2
STIHL AK Battery
–
Battery technology: Lithium-ion
–
Voltage: 36 V
–
Capacity in Ah: see rating label
–
Energy content in Wh: see rating label
–
Weight in kg: see rating label
–
Permissible temperature range for operation
and storage: -10°C to +50°C
20.3
Charger STIHL AL 101
–
Rated voltage: see rating plate
–
Frequency: see rating plate
–
Rated power: see rating plate
–
Charging current: see rating plate
–
Permissible temperature range for use and
storage: + 5 °C to + 40 °C
20 Specifications
English
0458-806-9821-B.VA0.M20.
37