Join Date: Oct 2018
Location: Mid Atlantic USA
The cost isn't important, but for long term storage while not plugged in it is important. My i3, i8, Bolt and Leaf had negligible phantom drain, you could leave them 3 months at 50% charge with no issues. This is not true of Teslas, they have to be plugged in because they have drain that could empty a battery based on size and time. Older models are worse. If the battery fully drains and "bricks" you are done, you need a new battery. That would hurt.
Part of why this is important is you never want to leave a battery at full or empty for long period of time, so ideal storage would be around 50%. But if there is significant drain then you are either forced to fully charge before you store (full charge) or have it plugged in (remains full charge). The Tesla has a storage mode that maintains ideal charge if plugged in, but you have to have a plug where you store it.
I came back from one trip with my Tesla almost bricked because on a new firmware update something prevented the storage mode from kicking in the charger. I randomly checked and I was sitting at 7% in the red...I think I had one more week.