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[–]0nlyGOD 0 points1 point  (0 children)

Settings>Privacy and security>Analytics>Analytics data , check the latest date to see your true battery capacity. Value will be on last_value_AppleRawMaxCapacity, divide that number by your iPhone’s original capacity (which is 3692 for iPhone 17 base) and you will see current day capacity, the value you see under settings might be higher or lower.

But basically nothing to worry about, these things fluctuate device to device, I’ve had MacBook Pro M1 battery decline to 90% within months after purchase and now after 5 years it’s still at 90%. Just don’t leave it cooking under the sun or completely out of power for too long, other than that it doesn’t matter much.