I don't see any reason to worry about our early-2018 Model 3 with over 250K miles on it now. There's no reason to think that anything that exists today would have any resemblance to what will be around in 5 or 10 years, when there does start to be market for replacement batteries. By then, it will start becoming common and, likely, folks will start addressing the needs and new options will appear as the business starts to make sense.odel 3 units came out only 7 years ago, but I bet you people are already researching the best way to salvage and replace these batteries.