[Piotrsko]

13 years, so far not a noticable loss in a used volt pack, maybe couple mile less range. I don't go to the ragged edges anymore since I retired and the drive profile got simpler so it is harder to say with any authority. However Volts operating parameters were set up conservatively and most losses come from physical disconnection or permanent oxides in the lithium, both which are unavoidable. You can still score a newer model pack from the junkyards and those are still user replacements, but difficult ( big heavy thing underneath while laying on the concrete.) Havent seen a DIY battery jack yet from snapon.