Brother MPRINT MW-145MFi User Manual page 13

 This printer is powered with a rechargeable Li-ion
battery. If the printer can only be used for a short
period of time even though the battery is fully charged,
the battery may have reached the end of its service life.
Replace the rechargeable Li-ion battery with a new
one.
 To protect the circuitry, the battery cannot be charged if
the unit is in a location exposed to extremely high or
extremely low temperatures.
 Do not wind the AC adapter cord around the adapter or
bend the cord, otherwise the cord may be damaged.
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