The R8 failed to start despite being continuously linked to the CTEK MXS 5.0.

[Shmoein]

I attempted to start my R8 today, and a low battery alert illuminated on the dashboard. The last occasion I operated the vehicle was one month prior. My radar detector issued a low battery alert, indicating a voltage of approximately 6-7 volts.

In 2021, I swapped my original battery with another Audi battery, and the vehicle is consistently connected to CTEK. What factors contribute to the rapid deterioration of the battery? My vehicle has approximately 19,000 miles.

[RacingNight]

Transition to LFP battery.

[Cleverco]

If it was correctly connected to the CTEK and charging, I would guess a drain exists someplace, or perhaps an inside light was inadvertently left on. I would examine the radar detector initially.
If you drive it quite regularly, I would not recommend charging it constantly. It will likely reduce the battery's lifespan, but after four years, it should remain functional. Attempt to activate the desulphation mode on the CTEK, if available.

[Shmoein]

Regrettably, the vehicle accumulates fewer than 1,000 miles annually.

[Shmoein]

😁