Qn#(b)(4).The customer returned one 005853300 rusch mri handle batteries pack of 1 for investigation.Visual examination did not reveal any obvious defects or anomalies.Functional inspection was performed by inserting the battery into a known good lab inventory mri laryngoscope handle and attaching a known good lab inventory blade onto the handle.The led did not energize.It appears that the contact pin on the battery was deformed and flattened, which prevented the battery from making contact with the handle to form a closed continuous circuit.Once the contact pin was adjusted to make proper contact with the handle, the led energized for a few seconds and then turned off.The failure observed indicates that the contact pin became deformed during battery insertion into the handle.Additionally , since the led only energized for a few seconds, it appears that the battery has exceeded its useful life of 30 minutes.Based on the sample returned and the information available, it appears that unintentional user error caused or contributed to this event.The battery voltage was measured to be 3.010 v dc which is consistent with the nominal voltage.The device history record of lot 190401 was reviewed and no issues that could have contributed to the reported failure was noted.The device was manufactured according to release specification.
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