The autopulse platform (s/n (b)(4)) and 3 nickel metal hydride (nimh) batteries (s/n (b)(4)) were returned to zoll (b)(4) for evaluation.Investigation results as follows: a visual inspection of the returned autopulse platform was performed and found a crack near the screw hole.The autopulse is a reusable device and was manufactured on tbd.The physical damage found during visual inspection can occur due to normal wear and tear and/or physical abuse and is not related to the reported complaint of the platform stopped compression with error message of low battery level.A review of the archive showed user advisories (ua) 02 (compression tracking error), ua13 (battery fault detected), ua 44 (battery voltage too low during compression) and ua 45 (shaft not at "home" position) messages.The platform was functional tested and there were no problems or error messages noted using a fully charged battery.The reported event was not replicated.Testing of the 3 batteries shows that the power on the 3 nimh batteries was below 1300 w indicating the battery's capacity is below its nominal run time and the battery should be exchanged with a fully charged battery.Based on the investigation, there were no parts replaced.In summary the customer's reported complaint that the autopulse platform stopped after few compression with error message of low battery level was confirmed during archive review but not during functional testing.Although the customer stated that fully charged batteries were used, the power on the returned batteries was below 1300w which is below its nominal runt time.Therefore, the root cause for the platform stopping was the customer was using batteries that had below nominal run time capacity.
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