Mini Cooper Electric Auxiliary Battery Issue

I am experiencing a rather concerning electrical anomaly within my 2023 Mini Cooper Electric. Specifically, an error message is persistently displayed within the speedometer console. Error memory diagnostics confirm an auxiliary battery malfunction. Symptomatically, the engine start is noticeably weakened, indicative of a potential voltage drop. Battery charging, seemingly, is not occurring. I solicit your expertise in potentially elucidating the etiology of this issue prior to engaging professional diagnostic services.

4 comment(s)

I experienced a similar issue with my Mini Cooper Electric. Error messages appeared on the speedometer, and the car occasionally struggled to start. Have you checked the voltage of the auxiliary battery? A significant voltage drop could indicate a battery malfunction.

When you encountered this, was the error message consistent, or did it appear intermittently? Furthermore, did you attempt a battery replacement yourself, or was a workshop visit required?

The error message was consistent. I initially considered a DIY battery replacement but, lacking specialized tools and diagnostic equipment, I opted to take it to a workshop. They confirmed the battery failure and performed the battery replacement.

Thank you for the confirmation. I took the Mini Cooper to the workshop, and as suspected, the auxiliary battery was the culprit. Battery replacement including labor totaled 290€. All electrical malfunctions have ceased, and engine start is now nominal.

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