(b)(4).The device was returned and sent to the manufacturing site for evaluation.The manufacturing site reports "the device history record was reviewed and no issue that could have contributed to the reported failure was noted.The device was manufactured according to release specification.Product received at site and confirmed the reported failure of power failure issue.Mri cond fiber optic battery manufactured in aug 2019 and mri cartridges is having warranty or shelf life of 18 months and cumulative life span of battery approx.30 min max.We found that the mri cartridge was not working.We inserted new batteries in cartridge and found that it was working perfectly, so we are assured that electrical circuit of cartridge is perfect.We tried to get information from customer about approximate usage of battery before going to dead but unfortunately no specific answer received.Based on internal investigation, we can conclude that product has used for more than specified useful life.".
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