Originally Posted by CHFisker
I'll check after tonight- thanks for the warning (though I've already scheduled to drop it off and get it fixed). I hope it isn't the heater itself.
Seems like quite a bit of work to identify the defective battery module too.
Well, your HV battery error code will point in the right direction.
I would be surprised if it is more than one defect module sins your car dropping from around 7kms.
Read the error codes and you will probably be able to find out exactly which module in order to be replaced. Probably no need for excessive testing like in Afternoon Garage (by the way, nice and well-made series). However, you will not know which exact cell in which module that is faulty if you are considering repairing the module itself.
You may also try leaving the charger connected for a couple of days (trickle charging takes time), it may be that the modules are out of balance / deviating.