Both the Bolt's problem and the old C-Max problem was an EPA estimate issue. Both GM & Ford are guilty of not delivering on the EPA estimate, hence the similarity. Remember the consumer sees the Range Estimate for an EV on the Monroney the same as they do MPG on a hybrid.
The Bolt promised 238 miles range (EPA standard test), and now it can actually only get 90% of that (214), less than what the buyer thought
. C-max promised 47 MPG (important for a hybrid buyer), but really got 43 MPG when not "borrowing" Fusion drag numbers, less than what the buyer thought
Only charging to 90% or 95% probably reduces the odds of a fire from 1-in-10,000 down to 1-in-100,000, acceptable risk, meaning it does solve the problem to just cheat the owner out of some range & move on.
Could be this range problem will persist for some time. Battery issues can be hard to resolve, especially since new packs cost $18,000 (part+labor). I could see GM taking the Ford route & just throwing some rebate, maybe $1,000 here, to keep consumers from feeling cheated while their batteries can't be charged up all the way, likely a 10-year problem.
Example: Mustang Mach-E Monroney range part: