Read Status/Voltage of RTC Battery on Jetson Nano


I am using a Jetson Nano Dev-Kit B. I “installed” a Coin-Cell Battery of Type CR1225, and it is working fine. Now I am wondering if there is any way to read the Battery Voltage, so i can set up a Warning Message when the Battery is running low and needs to be replaced.

I already searched the Forum, but could not really get the Info I was looking for.

cat /proc/driver/rtc (as mentioned here) does not show any Info about the Battery at all:

rtc_time        : 09:54:36
rtc_date        : 2023-04-13
alrm_time       : 00:00:15
alrm_date       : 1970-01-02
alarm_IRQ       : no
alrm_pending    : no
update IRQ enabled      : no
periodic IRQ enabled    : no
periodic IRQ frequency  : 1
max user IRQ frequency  : 64
24hr            : yes
name            : 7000e000.rtc

Any help would be greatly appreciated!

Thank you


It is not able to check that. The pmic does not have such register to check battery status.

1 Like

@WayneWWW thank you for the clarification, i was almost expecting something like this

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