It is obviously abnormal. It may be that the battery or the components on the motherboard are damaged (both the battery and the motherboard have battery control components. Under normal circumstances, the components inside the battery are more likely to be damaged, which will lead to inaccurate power, so the battery can only be replaced. However, if the battery does not drop, it can still be used. Unless this happens, it is obvious that more than 30% of the power of the mobile phone is automatically turned off and the battery needs to be replaced.
The general situation of charging is the electromagnetic overload of your mobile phone. It is very bad for the battery that you keep charging your mobile phone, so there is a lot of virtual electricity after charging. You should charge it correctly to prevent the battery from being overcharged.
It's a little fast, and it's acceptable if it's around 90, usually around 90 a year, but it depends on how you use it. For example, if the battery is not properly maintained, it will naturally fall off, play while charging, or the number of times it is charged. If it is used normally, you can check that the mobile phone can drop to about 90% a year. Once it drops below 90, it drops quickly, and then it is even more exaggerated.