That is a direct sign that the onboard battery is dead or close to it.
Replacing the battery should clear it up.

Open the computer and locate the battery and carefully remove it....make sure that you see which waythe + (stamped on battery) is facing (up or down) Replace with the same number or replacement .

If you have trouble locating the battery or do not know what to look for, please refer to your computer manual.....downloadable PDF file from the manufacturer's website.

most are flat silver objects about the size of a US nickle and most are located towards the far end of the mobo away from the CPU chip.