This camera has an internal rechargeable battery for maintaining the date and time and other settings
regardless of whether the power is on or off.
This rechargeable battery is continually charged as long as you are using the camera. However, if you
use the camera for only short periods, it discharges gradually, and if you do not use the camera at all for
about one month it becomes completely discharged. In this case, be sure to charge this rechargeable
battery before using the camera.
However, even if this rechargeable battery is not charged, you can still use the camera, but the date and
time will not be indicated.

Charging method of the internal rechargeable backup battery

Insert charged battery pack in the camera, and then leave the camera for 24 hours or more with the
power off.

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DSC-W650