And I have several years/winters experience with a Hybrid (Civic) but only a few months in a TCH so I can't say for sure in this case...On the ECO gauge, if negative movement is not due to current flow, what else could they be using for indication? We are half way through our second winter with our 2012 TCH and I have not noticed reduced regeneration in winter. So we are not "all" saying that. Perhaps it is just because I have not noticed it, and as I indicated earlier I will try and watch more carefully. It is -18C here today and we hit -30C or so a couple of weeks ago, so there should be opportunities to see what it does.
My HCH definitely had reduced regeneration in winter and also using NiMH technology (admittedly not as advanced as in the TCH). It would appear to make sense if it did but that's pure speculation on my part. I will definitely pay attention myself too, in the coming months.
What happens below -40? car won't start? It's not likely going to drop much below -40 here in Montreal but it's not impossible...Yes, the battery will see full starting current, and I recall reports that it can start down to -40C (-40F).
Didn't the first TCHs still have a backup 12V starting system, as in the HCHs? I could have sworn I read that somewhere. Since they did away with it (or never had it), it appears the car can safely be started at any temperature.? That it doesn't start is one thing, that it damages the traction battery is another.