RTC Clock for Time Synchronization

Hello Experts,

CC: @Honey_Patouceul @DaneLLL @amycao @kayccc @WayneWWW @icornejo.a @AastaLLL @dusty_nv

Is there a provision to enable RTC (save clock) with a small-sized battery along with Jetson Nano development board?

Any other alternative suggestions ?

A super capacitor, a chargeable battery or coin cell like CR1225 all can work.