Does anyone know the chemistry used in the FFE batteries? I'm guessing it is lithium nickel manganese cobalt oxide (NMC) or something similar (maybe lithium nickel cobalt aluminum oxide (NCA)). I know lithium iron phosphate (LFP) was also around at the time (A123) but I don't think it was being used in cars at the time.
FWIW, I'm approaching 60k miles and so far battery capacity has not changed noticeably. I haven't done any run down tests, that's just based on my daily driving and what I see range wise.