NHTSA Complaint #11300363 — 2015 TESLA MODEL S

APRIL, 2019- MY MODEL S WAS STATIONARY AT A SUPERCHARGING STATION, BATTERY NOT CHARGING NORMALLY, INTERRUPTING WITH ERROR MESSAGE: BATTERY "RECALCULATING". A 90% CHARGE NORMALLY RESULTED IN 242 MILES OF RATED RANGE. SUDDENLY, A 90% CHARGE NOW RESULTS IN ONLY 210 MILES RATED RANGE. SINCE NEW, THE BATTERY GRADUALLY LOST A TOTAL OF 3% OF RANGE, OR 8 MILES, OVER 3.5 YEARS. SUDDENLY, THE LOSS OF RANGE IS AN ADDED 15% OR ANOTHER 32 MILES. THE CAR NOW CHARGES AT A MUCH SLOWER RATE. NORMAL SUPERCHARGER RATE OF CHARGE STARTS AT 116 KW. NOW, STARTS AT ONLY 60-80 KW. CHARGING NOW TAKING MUCH LONGER. I CONTACTED TESLA MULTIPLE TIMES, WITH THE ABOVE INFORMATION. I HAVE RECEIVED NO REPAIR OF ISSUE AFTER NUMEROUS ATTEMPTS AT RECEIVING SERVICE. I'VE RECEIVED MANY NEBULOUS, CONFLICTING, AND UNTRUE STATEMENTS FROM TESLA, REFUSING TO CONFIRM CLEARLY WHAT HAS CAUSED THIS BATTERY PERFORMANCE AND CHARGING PROBLEM. AT ONE POINT, THEY INDICATED "THE CHARGING RATE AND YOUR BATTERY'S CAPACITY WAS LIMITED TO PREVENT OVER DEGRADATION OF CELLS AND DAMAGE CAUSED BY OVERUSE OF SUPERCHARGING." ANOTHER TESLA REP STATED IT WAS CAUSED BY A FIRMWARE UPDATE, BUT NO ONE HAS PUT THAT STATEMENT IN WRITING. BUT, THEY STILL INSIST THE BATTERY HAS NO PROBLEM, AND NEEDS NO REPAIR. IF THERE IS NO PROBLEM WITH MY BATTERY THEN WHY DID TESLA CAP IT'S VOLTAGE AND CHARGING RATE WITH A FIRMWARE UPDATE? WHY WILL TESLA NOT RESTORE MY CAR'S PERFORMANCE? INDICATIONS ARE SUCH THAT EITHER THE BATTERY SHOULD BE REPAIRED OR REPLACED. CONSIDERING THAT THIS FIRMWARE UPDATE COINCIDED WITH SOME TESLA BATTERY FIRES, I AM CONCERNED THAT A FAULTY BATTERY COULD PRESENT A DANGEROUS CONDITION. TESLA HAS NOT BEEN FORTHCOMING WITH INFORMATION, ONLY REFUSING TO REPAIR THE ISSUE.