Also, the Model 3 can only supercharge at “full speed” when the battery is under the 50% level or so. After 50%, the charge rate starts to taper pretty quickly

Also, the Model 3 can only supercharge at “full speed” when the battery is under the 50% level or so. After 50%, the charge rate starts to taper pretty quickly. If the battery is cold then you may also see reduced charge rates. In cold weather, it’s better to supercharge after a long drive, as the battery will be warm.