The battery health status is 100%, indicating that you can currently use the battery capacity of 100%. Take iPhone XS as an example, 100% or 2658mAh battery can be used completely. Once the maximum capacity drops below 80%, reduce the frequency of the mobile phone, that is, the maximum battery capacity is below 70%, and the mobile phone will automatically turn on the performance management function (frequency reduction).
Therefore, if the maximum capacity of the battery is between 70% and 100%, it shows that the battery can still support the use of various functions of the mobile phone under normal circumstances. If the maximum capacity is less than 70%, the battery needs to be replaced.