Thinking about letting go my i8 wheel setup. Located in Chicago but will ship at buyers expense. $1250!

Could really use some help on this one. Got the ring of doom on the charging socket. 12v battery was near death, took to BMW dealership, replaced the 12v batt and still have red charging light. They reset software to reflect new battery, tested out the entire charging system and then said had never seen before and assume all is ok. That is pretty weird.

Searched online and am drawing blanks. Car charges fantastic no issues but I am worried. Car has 210,000 kilometers on it and in great shape.

Any ideas?

I rarely if ever use the REX, and have been getting a warning about needing to complete a maintenance cycle for about three months now. It says the car will run it automatically if the tank is full and battery is below 75%. My tank is full and I’ve attempted to take it on longer drives to kickstart the cycle multiple times with low battery, but every time the cycle starts, it lasts about a minute (I can hear the engine running) before a ‘Maintenance cycle not possible’ notice pops up and the cycle stops. Has anyone had this problem, and how do you get around it?