Sony CD-UX71 Operating Instructions Manual page 71

Menu items
USB CHARGE Sets whether battery will be charged using a USB
Settings (*: Initial setting)
connection or not.
ON*:
The battery will be charged.
OFF:
The battery will not be charged.

Note
If you use a USB AC adaptor (not supplied) to connect the IC
recorder to the AC outlet, you can charge battery regardless this
setting.
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