Apple battery health is expressed as a percentage, and 85% battery health can be considered as a good state. When the battery health is above 80%, the battery can still provide better performance and longer service life. With the passage of time, the health of the battery will gradually decline, resulting in shortened battery life and weakened battery life. If you are obviously dissatisfied with the battery life performance, you can consider replacing the battery or taking other measures to optimize the use of the battery.