Analysis of the electronic data from aed serial number (b)(4) identified that the device was placed in service on december 14, 2018 with battery pack serial number (b)(4).On march 24, 2019 during a routine self-test, the aed detected a possible problem and attempted to alert the user by flashing its red asi and chirping.The aed continued to flash its red asi and chirp until january 02, 2020 when the main battery pack became fully depleted or was ejected.There was no evidence in the electronic data of any human interaction to address the aed's condition.The aed remined off for an additional 8 months with no evidence of any human interaction until the reported rescue attempt on (b)(6) 2020 where the aed would not power on due to the depleted battery pack.Troubleshooting of the aed with a replacement battery by defibtech personnel over the phone identified that the aed was able to successfully pass a manually initiated self-test indicating that the aed is operationally ready.The cause of the event was identified as a failure to maintain the aed; specifically, a failure to maintain the aed's main battery pack.The customer was informed of the proper maintenance activities for this device and a replacement battery pack was sent.The aed currently remains in service.
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