Tesla's battery warranty activates at 70% up to 8 years/infinite miles. Needless to say, the expectation is that the overwhelming majority of cars won't see tha

Tesla's battery warranty activates at 70% up to 8 years/infinite miles. Needless to say, the expectation is that the overwhelming majority of cars won't see that much battery loss, and in fact the observed average is 10% loss at 150,000 miles. (This number, and this theory, are both from the article; I'm adding in the 70% number based on what Tesla has been telling consumers who ask about the warranty.) GM is probably playing out the same strategy: 40% is a loss rate that almost no Bolt owners will see.