Sangean U4 DBT (V1) - Manual (Page 11)

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Note:
Duration for charging your battery fully can be varied according
to the mAh capacity of a battery. Higher mAh batteries required
longer charging time.
Important:
Under some conditions the charging LED indicator may switch
off after flashing briefly. This may happen if the batteries are
already freshly charged, or if the radio detects that you may be
attempting to recharge alkaline batteries or mixed different types
or capacity of rechargeable battery. In these cases the charging
will be stopped.
AC operation
Before you plug the AC cord into the AC socket, be sure the
voltage is correct. If you have batteries in the radio and use the
AC power cord, the batteries will automatically be disconnected.
AC cable hook is designed to store the cord when the radio is
not in use.
Important:
The mains plug is used as the means of connecting the radio
to the mains supply. The mains socket used for the radio must
remain accessible during normal use. In order to disconnect
the radio from the mains completely, the mains plug should be
removed from the mains outlet completely.
Powered via DC IN socket
The radio can be also powered via the DC IN socket which
can allow  Volt DC, which is designed to be powered by the
vehicle or the boat so you can take the radio with you outdoors
or on the boat.
An additional cigarette lighter cable is required (not supplied) for
this device.
Note: Never use the  Volt socket in rainy or moist conditions
to prevent moist from entering the radio. Always keep the rubber
cover on the back well closed under these conditions.
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