After most Apple users push the system to update and upgrade the new version of iOS, the number of health will decline when the battery is turned on. The reason is that the battery health program will automatically recalibrate the battery health, and after recalibration, the battery health will often decline.
Matters needing attention in prolonging the service life of iPhone battery
Avoid excessive discharge, that is, avoid turning off the phone. During overdischarge, excessive embedded lithium ions will be fixed in the crystal lattice and cannot be released, resulting in accelerated shortening of life. Deep discharge is more likely to damage the battery. If it is not used for a long time, the battery needs to maintain a certain amount of electricity.
It is important to develop good charging and using habits. Charging while using can avoid shutting down when the battery is less than 20% or even dead.
Avoid overcharging, that is, unplug the power supply as much as possible after charging. When overcharged, too many lithium ions are embedded in the electrode and cannot be replenished in time, which may lead to lattice collapse for a long time, thus irreversibly damaging the performance of the battery.