Mobile phone batteries are consumable parts, and the longer they are used, the lower their energy efficiency. The battery capacity of Apple's mobile phone is an important parameter indicating the degree of battery usage. With the continuous use of mobile phones, batteries are gradually aging, and the maximum capacity is decreasing compared with new batteries. If it is less than 80%, it will be greatly affected in daily use, and if it is used more, it will basically be washed for half a day.
Check the second-hand Apple phone. You can check the following points:
1, screen: Look at the brightness level to the highest level to see if there is lace or bad spots;
2. Appearance: whether the mobile phone shell is painted or bumped;
3. Camera: Whether the front and rear cameras can shoot normally and whether the portrait mode can be used normally;
4, face recognition: can you unlock it normally, can you enter a new face, try it;
5, battery: enter the settings to see how healthy, you can play games for a while to see the actual power consumption;
Refer to the above content: Apple official website-after-sales maintenance