1. When the battery is charged, the charging voltage at both ends of the battery is higher than the terminal voltage of the battery, and the battery does not discharge. At this time, the battery is running in the circuit as a load, and the power supply of the various components of the phone is provided by the charger. Therefore, using the phone while charging has little impact on battery life in theory. However, it is still not recommended to play with the phone while charging, so that the phone will be hot.
2, affect the battery life, in real life may encounter, generally:
(1) Overcharge: the battery charge time is too long, and the charge exceeds the rated capacity of the battery. Now the mobile phone generally has a protection mechanism, after the battery is fully charged, the internal circuit of the mobile phone automatically disconnects the charging circuit. However, it does not exclude some poor quality seat charger or universal charger without designed protection circuit. So be careful when using a seat charger or universal charger.
(2) Over-discharge: Usually the phone will automatically shut down when the battery is too low (due to the low battery voltage). However, if you restart it, you will find that the phone still has power to use (battery voltage rises). Automatic shutdown is a manufacturer of mobile phone battery protection mechanism, the battery overdischarge will cause serious damage to the battery life, so the power is too low, please charge. It is recommended to charge the battery when it is convenient to ensure that the battery has sufficient power.
(3) Overtemperature: too high battery temperature will also affect the service life of the battery. The frequent discharge of the battery will heat up, and the overtemperature of the battery in actual use is usually due to this reason. Therefore, when playing large games or running other power-consuming programs, you need to pay attention to heat dissipation and control the running time of the program.
(4) Undertemperature: lithium batteries are not allowed to charge when the battery temperature is below 0 degrees Celsius.
(5) Overcurrent: The use of a high-power charger to charge the battery will cause damage to the battery. But now manufacturers will alarm when the charging current is too large. Of course, whether the charger and the universal charger have an alarm function is not known. The worst case of overcurrent is short circuit. Short circuit may cause battery explosion, burning, please do not try.
[The above answers are for reference only ~ welcome to add]