If the Apple phone can only be charged to 90%, it means that your battery is aging, and the general mobile phone battery will be aging in more than three years, and there will be no stopping to charge or the power consumption speed is very fast, at this time, the battery needs to be replaced to solve the problem.
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Generally, if the battery is used, its periodicity is more than three years, and do not charge while looking at the phone, which is very bad.
Appear to restore factory Settings, consider whether the battery performance aging attenuation to replace the battery attempt? If it can not be solved, it is a hardware problem to try to replace it