(b)(4).A device history record (dhr) review was performed reviewed on the lot number of the sample received (1451v3) and no issue that could have contributed to the reported failure was noted.The device was manufactured according to release specification.The sample was returned for evaluation.The led would not energize upon receipt.The cartridge was connected to a known good charging unit (located on the charging end of the device).Immediately the cartridge went into a battery/circuitry fail mode with the red charging light flashing.The unit was completely disassembled for further investigation.There were no visual signs of corrosion on either end of the battery, to include the battery itself, soldered joints, and pcbs.Wires were firmly attached.After disconnecting pcb from both ends of the battery a voltage test revealed that the li-ion battery was almost fully charged at 3.6 vdc.A conclusion code could not be chosen as the complaint was confirmed; however, a root cause was not established.
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