smatthew
Active Member
Either Tesla's charging algorithm is messed up, or there's something wonky with these batteries, or detecting 12V battery failure is tough!Agree, but FWIW my wife's 2015 S70D gave the obligatory '12V battery needs service' warning, and I had time to conveniently have it replaced. In the case of my 2018 P3D+, the battery was fine with no warning messages, and then cooked and at 6V the next day. Precipitous failure, not gradual degradation.
I doubt it's option 1. Tesla controls the 12V charging algorithm, and probably even has engineering approval from their battery supplier that it's appropriate. If that was the issue, Tesla would have updated the software
It might be option 2. If Tesla had received large batches of bad 12V batteries, they could have sued the supplier and everybody would have heard, and both companies stock prices would go down. Or, they act like adults and settle their differences in private....... it's a possibility.
Option 3 is most likely true. It's tough measuring the health of a 12V battery. Most existing models rely on measurements taken during the cold cranking process - a data point that a Tesla can never possess.