Lithium-ion battery is a kind of rechargeable battery, which is mainly composed of positive and negative electrodes, electrolyte, diaphragm, and shell. 

When charging the battery, lithium ions are applied to the negative electrode through the electrolyte, and the lithium ions embedded in the negative electrode come out when you play with the mobile phone. , and back to the positive electrode. 

In order to ensure that the lithium ions can be smoothly returned to the positive electrode from the negative electrode during charging, it is necessary to leave a part of the lithium ions in the negative electrode. 

Charging the battery to 100% overnight, and recharging the battery when it is completely exhausted is speeding up the speed of the battery being scrapped, so the best way to charge the mobile phone should be to charge it as you use it.