Battery health

Batteries are consumables. Battery health declines over time. That is normal. Once it drops below 80%, the battery is no longer considered fit for use. If that happens before your warranty expires, Apple will replace the battery at no cost. If it happens afterwards, you will need to pay for it yourself.

You cannot. Batteries degrade through use, environment, and age. There is nothing wrong.

Great! You’ve got many more charge cycles ahead