Maxcom MM831 User Manual page 70

a cold battery into the phone might cause the phone to
malfunction and might damage the phone.
The set contains a Li-ion battery. Old batteries pose
environmental risks. They should be disposed of at a
special place in a special container in compliance with
current regulations. Never throw old batteries or chargers
to municipal solid waste, they should be collected for
disposal.
NEVER PUT BATTERIES AND CHARGERS INTO
FIRE!
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