Additional/updated information was added to reflect the device being returned to the manufacturer for evaluation.Two supplemental batteries were returned for evaluation, and subsequent testing verified the complaint.The underlying cause could not be determined after reviewing the documentation in this investigation.Per the initial evaluation, the first battery (serial number (b)(4)) would not hold a charge.An expanded evaluation was performed.Per the expanded evaluation report, there were no physical defects with the unit.However, when connected to a test concentrator, the battery only ran for 61 minutes on flow setting 5 before the battery was depleted, which is less than the target battery duration of ~80 minutes.The pcb was observed to be in good condition, and both the white and black wires had connectivity; however, a small nick was discovered in the insulation of the black wire.Per the initial evaluation, the second battery (serial number (b)(4)) had cord/wire damage, as the cord was pulled out.An expanded evaluation was performed.Per the expanded evaluation report, the strain relief had been severed and the insulation of the white positive wire was damaged.When connected to a test concentrator, the battery was not able to supply power.The pcb was observed to be in good condition, and the black wire had connectivity; however, there was no connectivity across the white wire.
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