The device was not returned to zoll medical corporation for evaluation.Instead, the superpower ii battery (sn (b)(6)) was returned for evaluation.The customer's report was verified, however, it was attributed to a depleted battery due to use.A review of the battery log did not observe any discrepancies.The customer was sent a replacement battery.Analysis of reports of this type has not identified an increase in trend.The x series operator's guide states: "always carry at least one fully charged spare battery.If no other source of back-up power is available, two spare batteries are advisable".
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