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CHW-1972: AFF A900 and FAS9500 systems report a false positive "nvram.battery.chargeFET.off" event BMC FW 16.4 and later on

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Issue

AFF A900 and FAS9500 systems report nvram.battery.chargeFET.off error that self corrects in 1 minute:
[NODE02: env_mgr: nvram.battery.chargeFET.off:debug]: The NVRAM battery charge FET is off. To prevent data loss, the system will shut down in 24 hours.
[NODE02: env_mgr: nvram.battery.chargeFET.normal:debug]: The NVRAM battery charge FET is on

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