I was told by dealer that the battery had three sections and the voltec 8yr/100k does not cover the 2 out of 3 sections that are bad. Service said it would cost $24000 to fix. I was like Wow. Please help me understand. Im the original owner and its a 2012 Diamond white fully loaded model with 48000 miles. I just need a better understanding. If someone could help me with the main battery being three separate sections and excluding the warranty PART?