Upon initial receipt of the event, it was determined that the event was not reportable based on the customer information provided.An engineering review on 3/15/2017 determined that this event is reportable.The unit was returned and an engineering evaluation has been completed.Upon visual inspection, 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 occurred in the lower battery pack between the cells and pcb.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.A recall is ongoing.Reference z-2716/2717-2016.
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