Nissan X-Trail e-POWER 2023 Owners Manual
5.4.2.1. 
12-volt battery charge warning light
When the power switch is in the ON position, the 12-volt battery charge warning light illuminates and then turns off.
If the 12-volt battery charge warning light illuminates while the e-POWER system is running, or while driving, it may indicate the charging system is not functioning properly and may need servicing.
The charging system may not be functioning properly if the 12-volt battery charge warning light illuminates while the e-POWER system is running. The e-POWER system will stop operating when the 12-volt battery becomes discharged. Immediately stop the vehicle in a safe place and contact a NISSAN dealer or qualified workshop.
Owners Manual