Let’s preface this story with a disclosure: battery degradation is not anything new. As Autoblog points out in its report, the Nissan Leaf, Tesla Model S and other vehicles all suffer from loss of battery capacity.
But, according to the 2017 Chevrolet Bolt EV‘s owner’s manual, the brand is preparing owners to accept the fact their vehicles may lose up to 40 percent of its capacity over eight years. That equals out to 143 miles of range should the worst-case scenario come true.
Per the Bolt EV’s owner’s manual:
Like all batteries, the amount of energy that the high voltage “propulsion” battery can store will decrease with time and miles driven. Depending on use, the battery may degrade as little as 10% to as much as 40% of capacity over the warranty period. If there are questions pertaining to battery capacity, a dealer service technician could determine if the vehicle is within parameters.
So, yes, in the year 2025, your new Bolt EV may not be chugging along to 238 miles of range. However, with the way battery and propulsion technology is moving, who knows what kind of solutions will be available to remedy the problem.
It is worth noting not one Chevrolet Volt battery has been replaced for degradation but were also talking about a full-fledged EV here rather than a PHEV.