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Disable stamina mode,after this go to settings-apps-all-eco mode controller,force stop and clear data.Restart your device and enable stamina back.
And charge it to 100%,after that disconnect.
Is this following a reset or an update? If so, I would advise using your phone normally for a while to let the figures sort themselves out.
5 days on stamina and 1+ days on normal sounds like figures I've seen on mine, however this will change depending on how you use the device.