At the beginning, the new mobile phone needs to be fully charged, otherwise it will go to the host and follow up according to your own needs.
The mobile phone doesn't have to be fully charged every time. The life of lithium battery is mainly reflected in the charge-discharge cycle. This cycle is an absolute concept. The last time I used 30% electricity, I was fully charged, and the next time I used 70% electricity, I was fully charged. This is just a charging cycle. Therefore, we still use the slogan of the inventor of lithium battery "charging immediately means charging immediately".
Charging refers to the process of recharging batteries and other equipment. Its principle is to let direct current pass in the opposite direction of discharge, so as to restore the active substances in the battery. Now, there are extended meanings such as study and work. The working process in which a battery receives electric energy from an external circuit and converts it into chemical energy of the battery. After the energy of the battery is discharged, it can be recovered by charging and discharged again, forming a charging and discharging cycle. Usually, DC current (also called asymmetric AC current or pulse current) is used for charging. Under different circumstances, different charging methods are used, such as constant current charging, constant voltage charging, floating charging, trickle charging, urgent charging or a combination of these methods.