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6 Docking Station and Power Supply Safety
6.2 Warnings and Instructions
WARNING
■ To reduce the risk of fire, electric shock and other 
personal injury or property damage:
– Read and follow all cautionary markings on the 
docking station, power supply and robotic mower 
and all instructions in this manual before using the 
docking station.
– Use the ADO 401 docking station and OWA-60U-
27VUSM power supply only for charging the 
STIHL RMI 422 PC-L robotic mower. Using the 
docking station or power supply for other purposes 
is prohibited and may lead to fire, explosion or 
electric shock, resulting in serious or fatal personal 
injury and property damage.
– Never use a damaged or improperly functioning 
docking station or power supply.
– Never use or charge a robotic mower if the hood or 
housing is cracked, deformed or excessively hot, if 
battery fluid is leaking from the battery compartment, 
or if the battery is otherwise damaged. A damaged 
battery increases the risk of personal injury and 
property damage from short circuit, fire or explosion.
– Connect the power supply cord only to a properly 
covered Class A Ground Fault Circuit Interruptor 
(GFCI) receptacle that has an enclosure that is 
weatherproof with an attachment plug cap inserted 
or removed. Do not use with receptacles that are 
weatherproof only when the receptacle is covered 
(attachment plug cap not inserted and receptacle 
cover closed).
– Never plug the docking station into a power strip or 
an extension cord.
– Do not operate a docking station or power supply 
that has received a sharp or heavy blow, has been 
dropped or is otherwise damaged or not functioning 
properly in any way.
– Do not attempt to repair, open or disassemble the 
docking station or power supply. There are no user-
serviceable parts inside.
■ The docking station and power supply heat up during the 
charging process. To reduce the risk of fire:
– Use the docking station and power supply only within 
an ambient temperature range of 32 °F to 122 °F 
(0 °C to 50 °C). 
– Do not operate the docking station on a combustible 
surface (e.g., paper, cardboard, textiles) or in a 
combustible environment.
– Allow the docking station and power supply to cool 
down normally. Do not cover them.
■ The docking station can produce sparks which may ignite 
combustible gases, liquids, vapors, dusts or other 
combustible materials. To reduce the risk of fire and 
explosion: 
– Do not operate in a location where combustible 
gases, liquids, vapors, dusts or other combustible 
materials are present.
■ Using a damaged power supply cord or plug may result in 
fire, electric shock and other serious personal injury or 
property damage. To reduce these risks:
– Unplug the power supply from the electrical outlet 
when the docking station is not in use for charging or 
mowing operations.
– Never jerk the power supply cord to disconnect it 
from the electrical outlet. To unplug, grasp the plug, 
not the power supply cord.
– Do not use the power supply cord for carrying or 
hanging up the power supply.
– Make sure the power supply cord is located or 
marked so that it will not be stepped on, tripped over, 
come in contact with sharp objects or moving parts, 
or otherwise be subjected to damage or stress.
– Check the power supply cord and plug 
before use and regularly thereafter for 
damage. If damaged, immediately 
disconnect from the electrical outlet.