Watched a year an a half old Youtube video where Dr. Goodenough made an interesting comment about 5 minutes in. He stated that Tesla owners would need to replace their battery at a cost of $28K after two years. I thought it was well known, at that time, that the Tesla batteries normally had at least 90% capacity after five or more years? Being a world renowned expert on battery tech, I thought his statement was interesting to say the least! Thoughts??