Date and time keep resetting

Date and time keep resetting I set my date and time accordingly in my camera and after some time, eg half a day - a day, I notice that it's reseted back to 2012.
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Guest [Entry]

Samsung instruction booklet for my NX100 says : insert fully charged battery and wait at least 72 h for the internal battery to be charged.

Guest [Entry]

"There is tiny internal Li-Ion battery soldered on the main PCB, which has to be replaced.

Battery model: ML414RU"