RS7 Alarm System Failure Points to Bad Backup Battery

As someone with moderate experience working on Audi vehicles, I encountered a very similar battery alarm issue with my 2020 RS6. After performing a battery check, it turned out the auxiliary alarm battery was completely drained and needed replacement. The electrical issue affected the entire alarm system, triggering unusual alerts while ironically making the actual security features non-functional. The system diagnosis revealed the original auxiliary battery had degraded faster than expected, which is relatively common in these models. The repair took about 3 hours at the workshop. They had to remove several interior panels to access the auxiliary battery compartment, replace the battery, and recalibrate the alarm system. Total cost was 330 Euro, including parts and labor. To better assist with your specific case, could you share: Current mileage on your RS7, When you first noticed the alarm system issues, Whether you see any other electrical system warnings, If the car has been sitting unused for extended periods This information would help determine if your case matches the common battery issues in this model range or if further diagnosis might be needed.

Thanks for sharing your experience. My RS7 has 115002 KM and had its last service 2 months ago. The auxiliary battery and car alarm problems started about a week ago. After reading your response, I checked and noticed the issue seems very similar. The electrical issue appears isolated to just the alarm system with no other warning lights. Good to know about the repair timeline and costs. The battery check results from my diagnostic tool match what you described with the drained auxiliary battery. Did you need to program the new battery or was it plug and play? I will schedule the repair this week based on your feedback.

Thanks for the additional details. After replacing my auxiliary battery for the car alarm system, it did require programming using dealer-level diagnostic equipment. The workshop had to properly integrate the new battery with the vehicle's security system, it wasnt a simple plug and play solution. The system diagnosis pattern you describe matches exactly what I experienced. The isolated electrical issue affecting only the alarm system, with no other warnings, is a classic sign of auxiliary battery failure in these models. A key warning sign I noticed before the complete failure was occasional false alarms, especially during cold starts. If you are experiencing similar symptoms, its definitely the auxiliary battery. The programming took about 30 minutes of the total repair time. Make sure the workshop has experience with alarm system calibration for this specific model. The battery itself was around 180 Euro, with labor and programming making up the rest of the cost. With your mileage being similar to what mine was at the time of failure, this is likely just normal wear. The auxiliary battery typically lasts 3-4 years depending on usage patterns and climate conditions.

Thanks everyone for the detailed responses. After reviewing all the information, I feel much more confident about the repair process now. The symptoms match perfectly, from the system diagnosis showing the drained auxiliary battery to the car alarm acting up while other systems work fine. Just booked an appointment with my local workshop for next week. Made sure to confirm they can handle the programming part since the battery check confirmed its not just a simple replacement. Expecting around 350 Euro for the complete job based on the feedback here. Really helpful to know about the 3-hour timeline and the programming requirements. Will make sure to mention the battery alarm issues and false triggering when I drop it off. At least now I know this is a common auxiliary battery problem and not something more serious with the electrical system. Great to have confirmation that this is just normal wear at my mileage. Appreciate all the guidance on what to expect during the repair process.