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MR was a reduced cell count LR pack. It is physically different than the SR+ (which is software limited to make the SR) SR & SR+ Battery Questions & Thoughts
There is no such thing as an "SR+ Medium Range". There is a "Mid Range", (a.k.a., LEMR - Limited Edition Mid Range) which was produced for about 5 months from ~Oct 2018 - Feb 2019. it has the same pack as the LR with some cells removed. This was a temporary measure to offer a lower cost car because the SR/SR+ design wasn't complete yet. The Mid-Range has the full "Premium Interior" that the LR models have.
The SR is the exact same car as the SR+ (including pack) with the SR being software locked to lower usable capacity and other features.
MR was a reduced cell count LR pack. It is physically different than the SR+ (which is software limited to make the SR) SR & SR+ Battery Questions & Thoughts