I had always assumed that the battery pack required some heating before high-speed DC charging, but that once the charging got underway most of the noise the car makes was due to cooling. I had also assumed that ~25°C was best for the batteries. See this (admittedly old) post which mentions staying <35°C: A Bit About Batteries I normally charge to 75% at home from a 240V 15A socket, but yesterday I charged from 50% to 99% at a (non-Tesla) 50kW CCS charger. Outside temperature was ~15°C, and the charge rate was ~35kW for most of the charge. I have recently started using TM-Spy to monitor a lot more real-time info about the car. This is the first time I have used it during a fast-charge session, and I noticed some very unexpected thermal behaviour. The image below shows a situation near the end of the charge with SoC ~97%. The charge power into the battery was ~11kw and the cell temperatures were ~53°C (which seems pretty hot to me), but the car was still trying to HEAT the battery. It was pouring 3.5kW into each of the front and rear motors, with a reported stator temperature of 130°C, which was heating the coolant up to 60°C at the battery inlet! I would have expected the car to be trying to cool the batteries down, not heat them up. It also seems like an awful waste to be using 7kW of the "charge" power just to make things hot. Does anyone have any thoughts on this??