No product was returned for evaluation.The investigation of this complaint is based on the information in this complaint.The device history record review noted no anomalies, or non-conformances with the device or the batteries.The manufacturing process review noted no systemic issues.The customers reported event is that the battery pack was sitting on the cleaning cart after the procedure and exploded.Without the returned device or photographs the reported event cannot be confirmed.With the available information, a determination of a true root cause cannot be made.Historically, the most prevalent cause for the battery pack exploding is due to severing the electrical wire from the battery pack to the hand-piece.Cutting the wire can cause catastrophic electrical short initiating node expulsions of the batteries.The device instructions for use and the labeling on the tyvek lid warn that cutting the battery pack cable could lead to shock, excessive heat and/or sparks, and could result in fire or personal injury.The batteries should be physically removed from the battery pack, care should be taken and personal safety equipment should be worn.The pulsavac hand-piece is normally exposed to biological fluids and as such would be treated as a bio hazardous material after the procedure.Since, the battery pack was sitting on the cleaning cart it is most probable that the electrical wires were severed to remove the battery pack from the hand-piece.Speculatively, the most likely cause for this incident is improper disposal of the device in contradiction of the ifu warnings by the customer.
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