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Patient 1
THE INITIAL REPORT DID NOT INDICATE THAT A POTENTIAL THERMAL RUNAWAY EVENT OCCURRED AND THUS, WAS NOT DEEMED A REPORTABLE EVENT. UPON FURTHER INVESTIGATION, A VISUAL INSPECTION WAS CONDUCTED AND IT APPEARS THAT A THERMAL EVENT OCCURRED. IT IS NOT POSSIBLE TO DETERMINE THE EXACT SEQUENCE OF EVENTS THAT LED TO THE THERMAL EVENT. HOWEVER, THERE IS EVIDENCE THAT A SHORT OCCURED IN THE LOWER BATTERY PACK BETWEEN THE CELLS AND PRINTED CIRCUIT BOARD. THERE WAS A BLACKENING ON THE TOP OF THE LOWER BATTERY PACK AND ITS PRINTED CIRCUIT BOARD (PCB). CELLS 2 AND 3 APPEAR TO HAVE BEEN INVOLVED IN THE THERMAL EVENT, LIKELY BY SUPPLYING ENERGY INTO A FAULT IN THE BOARD. ADDITIONALLY THERE WAS A SLIGHT MELTING OF THE HANDSET PLASTIC ENCLOSURE. THIS CONCLUDES THE INVESTIGATION.