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Applicable model(s) COOLPIX SQ

Q.No.4216: Is there a backup battery for data such as date/time information?
Ans : Data is backed up by an internal dedicated backup battery charged by a rechargeable Li-ion battery or AC adapter.
The backup battery begins charging when lithium battery is inserted or the camera is connected to the AC Adapter, and stops automatically after 20 hours.
A fully charged dedicated backup battery can preserve data for approximately one day.
If you do not use the camera for a long time, remove the batteries before storing.
Note that it will be necessary for you to set the date/time before using the camera again.