At first, I was told by the service department at a local dealership that my car needed both the main battery and the auxiliary battery replaced. The amount they quoted was beyond ridiculous, so I approached John at TAS. John told me that TAS will never oversell, and will only perform the services that are necessary for my vehicle. After going through the diagnostics, John told me the only battery that needed replacing was the main battery. The service was completed in the same day, and the amount that TAS charged me was about 40% less than ONE of the batteries that the dealership wanted to replace. Excellent work by the guys at TAS!