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Roadster Fires?

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I heard of one smoking 12 volt battery when they were still using Chinese batterys in a 2.X.....
That's part of why they have all been replaced................... at yearly service visits.....................under warranty.

No, that's not correct. The smoking was due to the battery wires rubbing on the edge of a carbon fiber part, which cut through the insulation resulting in a short. Tesla installed abrasion protection for those wires in all Roadsters after that incident.

The batteries are replaced periodically because they have a limited lifetime. That type of battery lasts a couple of years in most applications, in my experience.

Incidentally that one incident resulted only in smoke, not in a fire. The vehicle was not significantly damaged.