I just read that for a Chevy Bolt EV, they can troubleshoot and repair batteries with replacement done on an individual module basis. From Chevy:
"Whole battery-pack replacement is also largely mitigated by the design, manufacturing technique, dealer diagnostic, and repair tools included to support the manufacture, sale, and service needs of the Bolt EV, meaning individual modules can be replaced should it be required."
It also says that in 7 years of Volt (not Bolt) sales, Chevy has never had to replace a battery pack under warranty. That's some cause for optimism (or fear that Chevy is just intractable).
Taken from: https://insideevs.com/news/333287/heres ... ery-costs/
As I understand it, at least for the 2015 and newer Sparks, the cells are the same as the Bolt's. If anyone knows, does this mean that the Spark's battery can be serviced with individual module replacement, making the need for whole battery replacement even more unlikely?