The unit was returned and an evaluation was 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 printed circuit board.There was a blackening on the top of the lower battery pack and its printed circuit board.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 completes the investigation.
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It was reported that the battery was on the charging cradle overnight and when the office returned to work, a melting plastic smell was noticed, which was the battery melting.The charging cradle looks as if the battery melted on it.There was no report of injuries, patient or user involvement, or impact to patient care.
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