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12 LED Diagnostics and Acoustic Signals
Operate the charger only indoors, in dry rooms and within an 
ambient temperature range of 41 °F to 104 °F (5 °C to 
40 °C).
The battery heats up during operation of the power tool. If a 
hot battery is connected to the charger, it may be necessary 
for it to cool down before charging starts. The charging 
process begins only after the battery has cooled down 
sufficiently.
Charging time depends on a number of factors, including 
battery condition and the ambient temperature. For a 
complete list of approximate charging times, see 
www.stihl.com/charging-times.
To charge an AR battery:
► Push the plug of the connecting cord (1) into the 
socket (2) of the AP Adapter (3) until it stops.
► Push the AP Adapter into the charger (5) until it stops.
The LED on the charger (4) glows green when the battery 
is charging.
The LEDs on the AR battery glow green and show the 
state of charge.
When the LEDs on the battery turn off, the charging 
process is complete and the charger will shut itself off.
► Remove the AP Adapter from the charger and disconnect 
the charger's power supply cord from the electrical outlet 
when charging is complete.
► Charge STIHL AR backpack batteries only with genuine 
STIHL AL 300 or AL 500 series chargers.
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 electrical outlet.
► Charge STIHL AP series batteries only with genuine 
STIHL AL 101, AL 300 or AL 500 series chargers.
12.1 STIHL AR Backpack Battery
12.1.1 Battery Status
Six LEDs and an acoustic signal indicate the status of the 
battery.
12 LED Diagnostics and Acoustic Signals