BR666T
Member
I did some CHAdeMO testing today (put another way: I donated $13 to eVgo to bring you this juicy technical detail, lol). The behavior is unchanged since it was first discovered... thus to mean: very bad.
It heats the battery up to about 129 degrees F, which takes about 35%-70% SOC charge to get there (about half an hour or so?). Once it's there, it finally turns off the motor (battery heater) and the battery temp stays stable at about 126~F for the rest of the charge, while finally letting the battery get all the juice it's being fed.
It accounts for about a 10% charge rate (/cost) penalty, somewhere around $1.30 of a $13 charge session gone up in steam as the battery cooling system immediately works to cool the battery back down to 86F once it's stopped charging.
Thank you for this information. How does this behaviour differ from Supercharging?