Mini Roadster Undervoltage Issue

I see you are experiencing a low voltage condition with your Roadster. I encountered a somewhat analogous electrical problem in my Mini Cooper, although I cannot say with certainty if the underlying cause is identical. Have you by any chance observed any unusual voltage drop when starting the engine, or perhaps flickering lights? A comprehensive diagnostic assessment of the power supply and battery health is advisable, if you haven't performed one already. What is the battery's manufacturing date, if you happen to know it?

Thank you for your reply. Indeed, I have noticed weak lights and the engine starting poorly. I suspect a significant voltage drop when initiating the engine. Is it probable that a heavily discharged or defective battery could induce failures across various systems? Furthermore, do you remember how did you resolve your electrical problem in your Mini Cooper?

Given your additional details, I would concur that a defective battery is increasingly probable. In my case, a similar constellation of symptoms was ultimately traced back to battery degradation and a parasitic drain. I would recommend a workshop visit to confirm this diagnosis. A thorough assessment of the battery health and charging system will be necessary to definitively ascertain the root cause of the low voltage condition.

I appreciate your insights regarding the potential battery issue. I have followed your advice and taken my Mini Roadster to a workshop for assessment. It appears the battery was indeed the primary culprit, exhibiting significant degradation. The replacement cost 290€, and now the undervoltage issue seems to have been resolved. Many thanks for your assistance!