Sony CDX-M20 - Battery and Operation Precautions; Lithium Battery Handling; Boat Ignition Operation Warning

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Note on the lithium battery
Do not expose the battery to excessive heat
such as direct sunlight, fire or the like.
Warning if your boat's ignition has no
ACC position
Be sure to set the Auto Off function
(page 14). The unit will shut off
completely and automatically in the set
time after the unit is turned off, which
prevents battery drain. If you do not set
the Auto Off function, press and hold
(SOURCE/OFF) until the display
disappears each
time you turn the
ignition off.