I was shocked to see GM is only warrantying 60% remaining capacity on the Ultium Battery at 100K miles, Unless I am reading something wrong, this is very lame...
That is really a bummer to hear. I doubt I’ll own it at 100k miles as I tend to trade often. However, I am a huge hummer fan so I plan on keeping this one an extended period, like maybe two to three years lol
I have to think GM is just covering their butt for the customer that is DC charging and WTF daily, and they do not expect to see that kind of degradation? But its not great...
60% means there is a legitimate defect that is leading to the loss of capacity. Natural degradation should never get that low, it's essentially a non-issue IMO.
Yikes, 60% is awful. I wonder if GM doesn't have that much faith in their battery. That's like the Hummer dropping down to a measly 180 mile full-charge range before they'd replace it.
I don't think that is it, I just think GM does not want to replace $30K battery packs that were abused. I am sure you have to abuse it hard and have some defects to get down to 60% in 100K miles
Dead cells will brick the vehicle and the battery will get replaced under warranty. The cells all have to be able to balance within a few millivolts, so one really bad cell will result in the module containing it having to be replaced. Failed cells and degradation are two completely different things. And GM really tightened up the battery monitor software after the Bolt recall, they do a lot more checks during charging now, looking closely at the balance of the cells.
Just for reference, I drove my 2017 Bolt to 103K miles before getting the new battery under the recall. It had lost about 10% capacity, and that is living in the Phoenix desert heat all those years.
Dead cells will brick the vehicle and the battery will get replaced under warranty. The cells all have to be able to balance within a few millivolts, so one really bad cell will result in the module containing it having to be replaced. Failed cells and degradation are two completely different things. And GM really tightened up the battery monitor software after the Bolt recall, they do a lot more checks during charging now, looking closely at the balance of the cells.
Just for reference, I drove my 2017 Bolt to 103K miles before getting the new battery under the recall. It had lost about 10% capacity, and that is living in the Phoenix desert heat all those years.