I bought 17' bolt about 3 years ago and it has 46k miles on it. A few weeks ago I noticed that the GOM shows a range of 80 miles after full charge, which I attributed to the fact that car was mostly siting in the garage and slowly discharging. I became concerned after I indeed got only about 80 miles before the green bars were all gone. Fully recharged and showed 80 miles range again. So I took it to the dealership and was told they will replace the battery. It should take a week for the parts and install. I'll see if they only replace a module or the whole thing.