Replacement high voltage batteries

[I3drivei3]

I recently purchased a top of the line 2015 i3REX with 60,000 miles in fantastic condition for $12,000. It just had the high voltage batteries replaced under warranty, so the car feels brand new to me. The previous owner had 69% left on the batteries so BMW replaced them. I feel like I got a great deal.
Is the technology in the new battery packs that were installed better than the technology on the original battery packs? It is different at all?

 

[mojo]

Is the technology in the new battery packs that were installed better than the technology on the original battery packs? It is different at all?

Each of the three variants used (AFAIK) Samsung SDI cells using similar cell chemistry, but three different generations, with improving packing density. The oldest of the three cell generations is widely recognised as being the poorest performer in terms of battery degradation with time/use - though of course any real-world statistics of that will be distorted by the fact that they are older than any of the later generations.

The technology itself did not, as far as I'm aware, change in any fundamental way.

Anecdotally, total replacement of the battery pack under warranty appears to be far more common with the 60Ah packs, and relatively rare for the 120Ah packs - again you have to account for the fact that the latter will on average be 5 or 6 years younger than the former.

 

[EvanstonI3]

The battery pack was replaced with the same type of batteries, not some updated varient.