"range extender cells" == shorter recharge lifetime cells that are only supposed to be used in 1% of trips (long ones). I wonder if these are just experimental

"range extender cells" == shorter recharge lifetime cells that are only supposed to be used in 1% of trips (long ones). I wonder if these are just experimental low-cycle cobalt/nickel or some other battery that normally isn't up to the cycle endurance of a consumer car. LFP for an everyday usage (200 miles in a day), which are high-endurance, good temperature range, safer, etc. I think this mixed mode is an excellent example of how "good enough"-density (200 wh/kg) LFP (and possibly even cheaper sodium) will be utilized. All these different cell chemistries can each be combined in heterogeneous packs for different use cases. So even if a cell can't do 1000 cycles, it might be usable for the rare trips. Or maybe make that high-density module more replaceable, and the long-endurance LFP/Sodium does Cell-to-Pack and that type of stuff. I think a typical consumer car in a few years will use a sodium or LFP for about 2/3 the cells (by weight/space) and 200 miles of range, and another higher density SSB or modern cobalt/nickel high-density cell for another 200 miles of range. So the question is, what was the mix in this car? That's the big question.