This companion external battery was not in use by a patient.The customer reported that the indicator lights on the companion external battery were not working and when it was inserted in a companion 2 driver, the battery was not recognized by the driver.This alleged failure mode poses a low risk to a patient because the issue was observed when the companion external battery was not in use by a patient.In addition, it would not prevent a companion 2 driver from performing its life-sustaining functions, because companion 2 drivers have redundant sources of power.The companion external battery will be returned to syncardia for evaluation.The results of the investigation will be provided in a supplemental mdr.
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