Battery Health is the most comprehensive tool for gaining vital information about your MacBook's battery, such as current charge level, battery capacity, power usage, temperature, charge cycles and much more.
Be sure to check out the 'Tips' section within the app to learn a host of useful ways to improve the life of your MacBook's battery.
Note: This app contains in-app or external-module purchases.
Interesting. App says my battery is 3,5 yrs old, while I bought the macbook 2nd hand in 2015 with a new battery in it. SO battery should be at least 7 yrs old. So now I doubt all other information too.