As Tesla was a bit over-hyped these past few days because of the battery day. Reality seems to have set in quite hard.
The strong sell-off on the 21st of september, at 16:30, was the main indication that battery day wouldn't have a good outcome. The people that bought in to that will probably be forced to close today at a loss, therefore I predict a further downtrend, possibly testing the 320 lows.
In my own opinion a drop to 370 is practically guaranteed to happen this week. Afterwards, if it will cascade into a greater loss, is of course anyone's guess. If it does get below 370, it will be in buy-it territory.