Offroad electrical display

[jvkintheusa]

Last night my battery level showed 69% when I parked it. This morning it showed 75% when I first started it.... No, I didn't charge it overnight.
So, is the battery level only measured for the main battery and did the aux battery trickle charge the main overnight?

 

[Clark Kent]

Last night my battery level showed 69% when I parked it. This morning it showed 75% when I first started it.... No, I didn't charge it overnight.
So, is the battery level only measured for the main battery and did the aux battery trickle charge the main overnight?

Yes, main battery only.
Thread 'Intelligent Battery Sensor (IBS)' https://www.theineosforum.com/threads/intelligent-battery-sensor-ibs.12412930/

There is a good explanation of the trickle charge function at Section 10.2 and 10.3 of the Rok Dr guide. It may have taken a charge from the aux as you say or it could just be some drift in the IBS. It's not known for precision.