Analysis of a generator that was returned was completed on (b)(4) 2014.The battery showed a non-ifi condition.A review of the internal memory locations within the generator suggests the existence of an error in calculating the device's total consumed energy.This error results in an incorrect device longevity estimate.This event was previously investigated and this generator was found on the list of devices for this error.In addition, a review of the vns programming history database printout (shows ifi) and the internal memory locations within the generator verified the existence of an error in calculating the device's battery voltage.Additional monitoring of the device was requested.The pulse generator was programmed to the last known parameters from the vns programming history database (no as received parameters) and to the as received percent of battery capacity to monitor diagvbat for a period of time.The pulse generator showed no anomalies during the period that diagvbat was monitored.A comprehensive automated electrical evaluation showed that the pulse generator performed according to functional specification.Other than the noted errors, there were no performance or any other type of adverse conditions found with the pulse generator.
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