Backup battery for RTC (real time clock) life expired.
The printer continually operates the timer (even when power is off) and a lithium battery is established to operate the timer circuit (when power is off). This message appears when the power of the battery falls below the required value or when there is no power, and the printer is stopped.
Replace the lithium battery (be sure to initialize RTC and input date/time whenever the lithium battery has been removed from the circuit board). Initialize RTC and input date/time. Check the condition/existence of battery contacts. Replace the C362DRV board.