The reasons for charging to 80% are as follows:
1, low temperature will affect the battery activity, resulting in slow charging or can not be filled.
2, if the ambient temperature is normal, 15 degrees to 45 degrees, still can not charge, you can try the following methods: Use the original charger to connect to the home power supply for charging, the non-integrated device can be turned off to remove the battery, use a cotton swab to wipe the battery and the contact point of the phone, replace the battery if conditions permit or use the universal charging attempt, replace the power socket, charger, data cable charging attempt, if the phone can be turned on, it is recommended to back up the important data of the phone and restore the phone to factory Settings.
3, if the problem still exists, not solved, you can bring the purchase invoice, warranty card and mobile phone to the customer service center for testing, by professional engineers to solve for you.