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6 Battery Safety
6.1 Warnings and Instructions
WARNING
■ Use of unauthorized batteries can damage the trimmer 
and result in fire, explosion and personal injury and 
property damage.
– Use only genuine STIHL AK series batteries.
■ Use of STIHL AK series batteries for any purpose other 
than powering STIHL power tools could be extremely 
dangerous.
– Use STIHL AK series batteries only to power 
compatible STIHL power tools.
■ Use of unauthorized chargers can damage the battery and 
result in fire, explosion and personal injury and property 
damage.
– Use only genuine STIHL AL 101, AL 300 or AL 500 
series chargers to charge STIHL AK series batteries.
■ The battery contains safety features and devices which, if 
damaged, may allow the battery to generate heat, rupture, 
leak, ignite or explode. 
– Never use or charge a malfunctioning, damaged, 
cracked, leaking or deformed battery.
– Never open, disassemble, crush, drop, subject to 
heavy impact or otherwise damage the battery.
– Never expose the battery to microwaves or high 
pressures.
– Never insert objects into the battery's cooling slots.
■ High temperatures may cause the battery to generate 
heat, rupture, leak, ignite or explode, resulting in severe or 
fatal personal injury and property damage. Exposure to 
temperatures outside the recommended temperature 
range may also reduce battery life and performance.
■ To reduce the risk of personal injury and property damage 
in the event the battery emits smoke, an unusual smell or 
feels unusually hot while using, charging or storing:
– Immediately discontinue using or charging the 
battery. Contact the authorities in the event of fire or 
explosion.
■ To reduce the risk of a short circuit, which could lead to 
electric shock, fire and explosion:
– Never bridge the battery terminals with wires or 
other metallic objects.
– Keep a battery that is not in use away from metal 
objects (e.g., paper clips, nails, coins, keys).
– Never transport or store the battery in a metal 
container.
– Store the battery indoors in a dry room.
– Never store the battery in damp or corrosive 
environments or in conditions that could lead to 
corrosion of its metal components.
– Never operate this trimmer in the vicinity 
of any wires or cables that may be 
carrying electric current.
– Do not rely on the trimmer's insulation 
against electric shock.
6 Battery Safety
– Never heat the battery above 212 °F 
(100 °C).
– Never incinerate or place the battery on 
or near fires, stoves or other high-
temperature locations.
– Use and store the battery only within an 
ambient temperature range of 14 °F to 
122 °F (-10 °C to 50 °C).
– Never store the battery in direct sunlight 
or inside a vehicle in hot weather.
– Keep the battery dry. Protect it from rain, 
water, liquids and damp conditions.
– Never immerse the battery in water or 
other liquids.