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10 LED Diagnostics and Acoustic Signals
To charge an AP battery:
► Push the battery(2) into the charger(3) until it stops.
The LED on the charger glows green when the battery is 
charging.
The LEDs (1) on the battery glow green and show the 
state of charge.
When the LEDs on the battery go out, the charging 
process is complete and the charger will shut itself off. 
► Remove the battery from the charger and disconnect the 
charger's power supply cord from the wall outlet.
► Charge STIHL AP series batteries only with genuine 
STIHL AL 101, AL 300 or AL 500 series chargers.
10.1 STIHL AR Backpack Battery
10.1.1 Battery Status
Six LEDs and an acoustic signal indicate the status of the 
battery.
1 A short beep
The acoustic signal works as it should.
2 Four long beeps
The battery's charge is low. Recharge the battery.
3 Rapid succession of short beeps
There is a malfunction in the battery. The signal stops 
automatically after a few seconds. Do not attempt to 
charge, use or store the battery. Replace the battery.
These LEDs can glow or flash green or red.
► Be aware that your ability to hear the acoustic signal may 
be reduced when wearing hearing protection.
10.1.2 Power Tool Status
When the battery is connected to the power tool, the same 
LEDs on the battery will indicate the status of the power tool.
10 LED Diagnostics and Acoustic Signals
If one LED glows red continuously: the battery is 
either too hot or too cold. Allow the battery to 
warm up or cool down gradually at an ambient 
temperature of about 50°F to 68°F (10°C to 
20°C).
If the fourright side LEDs flash red and a rapid 
succession of several short beeps is emitted: the 
battery has a malfunction and must be replaced. 
Do not attempt to charge, use or store the 
battery.
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