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9 Charging the Battery
To set up the charger:
► Insert the plug(3) into a properly installed wall outlet(4) 
matching the voltage and electrical frequency stated on 
the rating plateon the charger.
The charger runs a self-test immediately after it is plugged 
in. The charger LED(1) will glow green for about 1second, 
then it will glow red briefly before going out. Once the LED 
goes out, the self-test is complete and the charger is ready 
to charge the battery.
► Position the power supply cord(2) so that it will not be 
stepped on, tripped over, come in contact with sharp 
objects or moving parts or otherwise present a tripping 
hazard or be subjected to damage or stress.
9.2 Charging
WARNING
STIHL batteries contain safety features and devices which, 
if damaged, may allow the battery to generate heat, rupture, 
leak, ignite or explode. Never charge a malfunctioning, 
damaged, cracked, leaking or deformed battery or use a 
charger that has been damaged. Never insert a wet battery 
or battery adapter. Never use a wet charger. Follow all 
product-specific warnings and instructions accompanying 
your battery and charger.
A battery is not fully charged when it ships from the factory. 
STIHL recommends that you fully charge the battery before 
using it the first time.
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 plugof 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 wall outlet when 
charging is complete.
► Charge STIHL AR backpack batteries only with genuine 
STIHL AL 300 or AL 500 series chargers.
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