This is my followup on this thread, started when I first saw incredibly low "Fully Charged" range mileage numbers:
1) Last Wednesday, despite a new "Fully Charged" low of 70, I attempted to make a 40 mile round trip. On that trip, when I saw the range numbers seem to fall faster than ever before, I had my first official range anxiety panic attack. I again called my dealer's service dept. they gave me an immediate diagnostic appointment;
2) Their initial diagnosis confirmed some type of problem with the battery. On short notice they generously provided me with a loaner vehicle while they went deeper into the Bolt EV's problem;
3) Several days later my dealer informed me Chevy was shipping them a replacement battery pack and it would be installed ASAP;
4) They kept me up to speed on this repair's progress, and a week after the Bolt EV's problematic battery pack was identified I was able to pick up my vehicle morning;
5) For the true geeks among you, here are the repair specifics:
- Data check found cell 64 is at 3.38, all others 4.12. Cell variance is 67%;
- Engineers asked for and analyzed session log data;
- They contacted the dealer and said to replace the entire high voltage battery assembly;
- The dealer removed and replaced the battery assembly, filled battery coolant, bleed the system, programmed the BECM. Code CDYN30576403, reset battery capacity and charged the battery overnight. Note also: This work was all completed under the Bolt EV's warrantee;
6) When I picked the Bolt EV up I was given specific instructions regarding how the new battery will best "learn" how to properly charge for maximum performance. Now that they have "Fully Charged" the Bolt EV I am to drive it until 50% of the EV battery range is expended. After that drive is complete the vehicle needs to sit for 2 hours prior to charging;
7) Finally, I received documentation informing me "...that the Hybrid/EV battery pack capacity and EV range will continue to learn as the vehicle is operated normally."
This entire experience has been a bit of an adventure, sort of what is to be expected with cutting edge technology. At the end of it all, which seems to have been resolved under standard warrantee protocol, I think the Bolt EV is ready for another period of relatively uneventful service. And, to be perfectly honest, sizing the Bolt EV up against the other EVs out there, I'm still really glad I decided to commit to this bad boy and to have it back. I'm also looking forward to driving it a lot more, and potentially grousing about it a lot less.