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I know for a fact that Service Battery status is stored in OSX files somewhere but not sure where?? Reinstalling Macbook removes this status.Running Macbook from external OSX removes this status.Reinstalling OSX and migrating original OSX removes the status. Id like to know where is this status hidden in OSX files to remove it without reinstalling?? Anyone has any idea where to look for it?

The OS does not hold the setting! What you encountered is when the OS install process ran it cleared the setting held in the SMC EEROM area after SMC has read off the battery cycle count and/or when the voltage sensor drops below a set threshold. You can see the see your batteries status using CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question It does sound like you need to replace your battery MacBook Pro 13" Retina Display Early 2015 Battery Replacement