Customer reports that she heard a "pop" and found the device had popped open and that one battery ruptured in the device and the other battery (two batteries total) was expelled across the room.The device was sitting on a shelf and unattended.No one was hurt.The device was returned to arc.A lab analysis of this type of unit failure was performed.There was no issue with the design of the device.The analysis of the battery included an optical microscopy, ct scan and 2d x-ray and indicated the failure was due to a single component (battery) malfunction.Report, attached.The suspect batteries have not been used in production since (b)(6) 2015.
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