Brother Mprint MW-120 Owner's Manual page 8

Precautions
Warning
If the printer is not fully charged after the specified amount
of time has passed, stop charging it, otherwise fire, electric
shock or damage may result.
Caution
Keep the printer out of the reach of children, particularly
infants, otherwise injuries may result.
Stop operating the printer if it leaks or becomes discolored,
deformed or otherwise defective.
Others
The built-in lithium ion battery is slightly charged so that the
operation of the printer can be verified; however, the bat-
tery should be fully charged with the AC adapter before the
printer is used.
Do not leave the printer in a closed car under a hot sun,
otherwise it may be damaged.
If the printer is not to be used for a long period of time, be
sure to charge the lithium ion battery at least once every
six months in order to prevent a reduction in the efficiency
and life of the battery.
This printer is powered with a built-in lithium
ion battery. If this printer can only be used
for a short period of time, even though it is
fully charged, the battery may have reached
the end of its service life. Replace the lithium
ion battery with a new one.
Li-ion
Contact the sales representative where the
printer was purchased to have the built-in
lithium ion battery replaced.
vii