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23 Troubleshooting Guide
23.2 Charger
Runtime is too short. Battery not fully 
charged.
► Charge the battery, @ 10.1.
Useful life of battery 
has been reached or 
exceeded.
► Have the battery checked by an authorized STIHL servicing 
dealer.
Battery is not being 
charged even though 
LED on charger 
glows green.
1 LED glows 
red.
Battery too hot / too 
cold.
► Allow the battery to warm up or cool down gradually at 
ambient temperatures of about 50 °F to 68 °F (10 °C to 
20 °C).
► Operate the charger only in enclosed, dry rooms at ambient 
temperatures of 41 °F to 104 °F (5 °C to 40 °C).
Always remove the battery before carrying out any inspection, cleaning or maintenance.
Condition LEDs on 
Battery
Cause Remedy
Condition LEDs on 
Charger
Cause Remedy
LED on charger 
flashes red.
LED flashes 
red.
No electrical contact 
between charger and 
battery.
► Remove the battery and reinsert it into the charger.
Malfunction in 
battery.
► Remove the battery and reinsert it into the charger.
► If the LED continues to flash, do not attempt to charge.
If 4 LEDs on the battery are flashing, it has a malfunction 
and must be replaced. Otherwise, have the battery checked 
by an authorized STIHL servicing dealer.
Malfunction in 
charger.
► Have the charger checked by an authorized STIHL 
servicing dealer.