Nikon COOLPIX-A - Manual (Page 46)

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The Clock Battery
The camera clock is powered by an independent, rechargeable power
source, which is charged as necessary when the main battery is installed
or the camera is powered by an optional EP-5C power connector and
EH-5b AC adapter (
0 247). A day of charging will power the clock for
about 2 weeks. If the camera displays a warning at startup stating that
the clock is not set the clock battery is exhausted and the clock has been
reset. Set the clock to the correct time and date (
0 185).
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The Camera Clock
The camera clock is less accurate than most watches and household
clocks. Check the clock regularly against more accurate time pieces and
reset as necessary.