1. Keep the phone on, connect the charger to charge 2. After the mobile phone LED turns green, it means that the battery is full, and your mobile phone is charged less than 100% until it is not charged 3. Turn off the phone, then connect the charger to charge, and let the phone charge again to the LED light to turn green. Unplug the phone charger 5. Turn on the phone, wait until the phone is turned on and fully entered the system, quickly shut down 6. Connect the charger again to the phone that has been turned off, and wait a few minutes before the LED light will turn green again. Start the phone into recovery mode (hold down the volume down button and power button at the same time to start), then select Recovery-> Wipe -> wipe battery stats The battery calibration is complete after following the above steps, taking only 5 minutes longer than usual to charge, but the calibrated battery is noticeably different from what it was before. Before the battery calibration, you will find that the battery of the mobile phone will drop to about 93% in the case of a slight use of a full charge, and after calibration, it can maintain a 100% state for several hours before it begins to reduce to 99%, in short, the calibrated battery will definitely surprise you.
Mobile phone battery can not be charged to 100, that is because your mobile phone battery may have unstable factors, resulting in the power display can not reach 100%, there is also the battery may be used for too long, resulting in the charging of the power is simply full of the stored power is simply unable to beat the standard, so the battery can not be full, so it is the battery problem. Then you can only go to a new battery to use.
The charging current is intelligently adjusted to prevent overcharging the phone itself and the battery from causing damage, when the phone is full, it will stop charging, and then start to consume power, when the power consumption to a certain extent, it will be intelligently adjusted to charge, so repeatedly, under normal circumstances, if the phone is charged for a night, the phone power is considered more normal at about 95%. So a long charge may not fully fill the battery.
There is also a case that the phone's reading of the electricity is an indirect display of the chip's calculation of the battery voltage value. There will be a certain amount of error. Please try charging after you shut down to see if there is any change.
Moreover, it is not ruled out that the charger voltage is not high enough, which usually occurs in some cottage chargers or some laptops.