The patient data file was reviewed and revealed multiple battery alarms and notifications that could be either from the driver's lack of recognition of the external batteries or from the external batteries being removed as part of the system checkout.The driver passed all functional testing.Additional testing was performed using external batteries that have previously met performance requirements.Testing was performed by inserting and removing the external batteries in an attempt to reproduce the customer issue of the driver not recognizing the external batteries.All test external batteries illuminated 4 leds (at least 80% charge level) and were recognized by the driver, as indicated on the driver's display.When a/c power was connected, it was recognized by the driver, and test external batteries were shown to accept a charge.When ac power was removed, the test external batteries successfully powered the driver.The external batteries used at the time of the reported issue were not returned with the driver and therefore could not be tested as part of this investigation.The root cause of the customer-reported issue of the companion 2 driver not recognizing external batteries could not be determined.The driver performed as intended with no evidence of a device malfunction.This issue will be monitored and trended as part of the customer complaint process.Syncardia has completed its investigation and is closing this file.(b)(4) follow-up report 1.
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