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Pack Access Plug (under voided label)?

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Under the left rear corner of the pack is a round label:
Tesla_85kWh_141.JPG

Under the label (uh-oh, voided) is a 6-lobe socket head cover plug:
Tesla_85kWh_143.JPG

Behind the cover is a 2-terminal connector, which runs directly to pack + and - voltage:
Tesla_85kWh_146.JPG

So is that plug used with jumper cables--like to jump off a car when the battery is too low?

What is it for, and how is it used?


It's located near the contactors:
Tesla_85kWh_166.JPG


and at the other end of the main BMS board, but where are the 2 lithium coin cell batteries?

Tesla_85kWh_018.JPG
 
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So is that plug used with jumper cables--like to jump off a car when the battery is too low?

What is it for, and how is it used?

I believe that that is used so that Tesla can quickly drain a pack before they pull it down and open it. Since they don't like to open packs with a significant charge.) They have a large mobile power "sink" that they can plug in to that port.

Early revisions of the pack didn't have that and they had to run the heater on full blast with the doors open for a very long time to drain the pack before they could service it.