Each time when my car charged up to 80%, this text will sent to my phone: Supercharging is nearly complete at TIME. Idle fees will accrue once charging has ended. My question is, How does Tesla charges idle fees to me? In future when people insert cards to purchase supercharging, that would make sense. Now all the owner has free charges and not required to show cards to charge. So just how it can be done? Or it's just a bluffing now?