My 6s plus is almost 2 years old and the battery life app is showing 76%. Have not benchmarked it but it was only slow for a week or two after upgrading to iOS

My 6s plus is almost 2 years old and the battery life app is showing 76%. Have not benchmarked it but it was only slow for a week or two after upgrading to iOS 11 and seems fine now. Did not notice slowdowns when using iOS 10 (which was when throttling was introduced)