Why does the mobile phone battery fail to charge

1、 Mobile phone problem
There is a charging problem in the mobile phone itself, which requires taking the mobile phone to a designated national warranty point for inspection and repair.
Before sending it, you should first make sure that the real problem is the mobile phone. Try using a good mobile phone battery and charger of the same model. If it still doesn't work when you use your own charger to load your mobile phone with someone else's battery, then try using someone else's charger together. The result still doesn't work. That is, there is a problem inside your mobile phone, and you have to send it for repair!
2、 Charger problem
If you use the replacement method mentioned above and replace it with someone else's charger, you can charge it in. That is, your own charger is broken. If there is a warranty, repair it as soon as possible. If not, send it to the after-sales service point of your brand of mobile phone and ask the manufacturer to repair it for you. Because the manufacturer is quite clear about their products, maintenance will be guaranteed. Don't send them to the street stall for repair.
3、 Battery problem
If you can recharge normally after replacing it with another good battery, it is your battery problem. After confirming that there is a problem with your mobile phone battery, take out your mobile phone battery first and observe whether it is swollen or not? Is there rust at the metal contact position? If the drum occurs, it means that the battery cell has a problem and has been damaged; Or it indicates that the cell phone battery cycle life has expired; Or the protection circuit board of the battery fails.