Federal safety regulators said Friday they are closing an investigation into two battery fires in Tesla Motors electric vehicles without seeking a recall after the automaker said Friday it will add a titanium shield to its electric Model S underbody and aluminum deflector plates.
The upgrade came in the wake of three battery fires in North America last fall.
The fires prompted the National Highway Traffic Safety Administration to open a formal investigation in November into 15,800 2012-2013 Model S EVs. The Palo Alto, Calif., EV manufacturer's fix satisified NHTSA.
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