My mobile battery is 5 years old which is 3300 mah power (OEM)…nothing serious…same diagnosis report error is showing on my mobile also . This is mobile company's way of earning . In which by showing the pre-programmed error
What is the Screen On Time that you are getting? If you are getting enough battery backup and there is no issue in charging time, it might just be a bug. This shows even for people who has got a new battery sometimes.
However, just to be on the safe side, remove the case and carefully check whether there is any bulge, panel gap, etc on the back of your device.
