Infrequent poster here, but considering I'm in the middle of replacing my propulsion battery in a 2012 with 110K miles I can tell you my cost for a re-manufactured battery is 4250, plus 500 installation, plus applicable sales tax. My Chevy dealer quoted 8K also for a re-manufatured battery. Seems GM is no longer offering brand new replacement batteries for 2012. Greentecauto.com is the place...repair facilities around the US.
I plan to fix this VOLT, enjoy the 18 month full replacement warranty, then sell this thing. GM was less than helpful dealing with this issue, even though it started giving symptoms just 125 days AFTER the 8 year warranty period expired....granted it had 110K miles at that point.
My specific issue was 'a fault' in battery section 3...which is no longer available by itself. Thus, one must replace the entire battery. And to those who think they can just use the engine and not the battery ....uh that's a big NO...explored that option with GM too. But without a 'functioning' propulsion battery, the generator will not start. Bottom line: No propulsion battery, no generator, means you have a very large paperweight, and you cannot even 'donate' your car to many of the fine charities that say 'donate your car to us'....with it being a 'dead' volt, I was told, 'no thank you'. So it's either bite the bullet and fix it..or use it for target practice. Which, I will say, crossed my mind more than once.
We'll see how the replacement battery works...maybe I'll post a review once I get it back in another 4-6 weeks. My local dealer (Dallas) says they are swamped with Volts needing replacements....go figure.