RTC battery replacement on Jetson AGX Xavier

Hello ,
When I power on My Jetson AGX Xavier I always find the time went back to the same date and time (01/28/2018) ,
I have checked the voltage of C512 and I found it about 1.8V, is this value wrong ? do I have to change it ? if so what is its reference and how can I change it ?

Please check if modifying the value under “backup-battery” can help or not.

→ hardware/nvidia/platform/t19x/galen/kernel-dts/common/tegra194-spmic-p2888-0001.dtsi

what means “check if modifying the value …”
where is the file “hardware/nvidia/…” please

Modify the linux kernel device tree. It has some configuration for the RTC battery.

Download the kernel source from our download center and you shall see the path I am talking about.