Yes, every vehicle I know of has the upper and lower buffer, the lower being the most important I believe I've read. So our 60 kWh battery is in fact something like 64+ and it's adjustable via software by GM. I think a recent update might have increased the buffer slightly on the Bolt, which some people could see as "degradation" due to a bit less kWh's being available for us to use as mileage.
Yes, the Bolt EV will moderate itself for protection in extreme heat and cold. But to be most effective, being plugged in at the time such as overnight in winter lets you use the utility power for that conditioning rather than consuming battery power. I installed a L2 at home just so I can precondition the cabin and have it toasty warm inside and defrosted every morning and still leave for work with a basically full battery.
Somewhere I read that the top and bottom "ends" of the battery are hidden from us, so we can never really charge the battery to 100% or deplete it to 0%. Do you know anything about this?
Also, I thought that the battery conditioning system would operate regardless of whether the car is plugged in. Am I mistaken?