I was driving my car and I got a red battery icon without saying visit workshop in the instrument cluster when I turn my AC on it doesn’t blow as hard the fan is noticeably lower than usual my command display went off once or twice while I was driving I’m not sure if it’s because the main starter battery is getting weak or the auxiliary battery is bad I also heard if it was auxiliary battery able to see that in the instrument cluster.

Battery light coming on usually means the alternator quit charging.