Khadas any RTC Calibration?

Hi everyone,
I am using Khadas Vim3 with Ubuntu OS and i have battery for RTC.
My system won’t connect internet so i would test RTC without power (just battery).
According to test conclusion, unfortunately second parameter slipped about 3 seconds for 12 hours.

I want to calibrate it, is there any chance or method for it ?

Best Regards

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