How to charge lithium-ion batteries—Lithium-ion batteries have no memory effect and can be charged at any time during our use. For example, our mobile phone battery can be charged at any time as long as there is time, which can greatly extend the service life of the battery. Do not call the mobile phone until it is automatically turned off, which will cause great damage to the battery, reduce the service life of the battery, and the single use time .

Standard charging for Li-ion batteries:

0.2C constant current to 4.2V, then 4.2V constant voltage until the current is less than 0.01C, the battery below 1000mAh can be set to 20mA. It can be considered that the lithium battery is fully charged in this state.

Because when the charging voltage is higher than 4.35V, the lithium-ion battery is overcharged, which has a great impact on the service life of the battery. If there is no protection board, when the charging voltage exceeds 4.6V, the lithium-ion battery will be damaged.