Upon visual inspection, it appears that a thermal event occurred.The thermal event caused significant melting of the handset such that a complete root cause analysis cannot be performed.It is not possible to determine the exact sequence of events that led to the thermal event.There is evidence that a short circuit occurred in the battery pack assembly.Upper battery pack of handset fused to handset printed circuit board and melted plastic due to expansion and heating of upper battery pack, which also fused the handset to the charger.No apparent heating of lower battery pack.This concludes the investigation.
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