Device time issue

1.If after power off and restart, time changes to a faulty time, but time keep going , pls change the button battery.

2.If device time is slower or faster less than 3 seconds, pls adjust time by “Time Calibration” parameter in the software.

3.If time error range is more than 3 seconds, maybe the time crystal oscillator is fauty.

4.If the time is messy, maybe the time chip is fauty.