Battery

Apple considers your battery fit for purpose until it drops below 80% capacity. Your battery dropping three percent in nine months is perfectly normal.

No, start worrying when the maximum capacity percentage goes down to 85-80%

Regards

Giulio

As Kirk posted, you’re in GREAT shape; you might also find the following article of some interest.

https://support.apple.com/en-us/HT208387

Only 3 percent from perfect.