It is within the normal range that the battery health of Apple 14 drops to 9 1% after 8 months of use. The health of the battery will gradually decline with the increase of service time, which is determined by the characteristics of chemical reactions inside the battery. Under normal circumstances, Apple officials believe that it is normal for the battery health to be above 80% within 1 year after purchase. Apple 14 battery is 9 1% after 8 months of health, which is a relatively good performance.