Device evaluation of battery charger sn (b)(4) has been completed.The reported problem (unable to charge batteries) has been confirmed.Upon investigation the battery charger was unable to recharge a battery pack.The cause for the failure was contamination on the battery board pca.The root cause for the contamination was ingress of an unknown liquid.Lifevest patient training materials have been updated as a reminder not to expose the lifevest electronic components to liquids.No adverse event resulted from the defective battery charger.
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