1. Check the charging speed of the charger

　　Common chargers use a constant current charging method, and the charging speed is important depending on the current supplied by the charger. The higher the charging current, the faster the charging speed. The length of charging time is not only related to charging speed, but also depends on the capacity of lithium-ion batteries.

　　2. Check the charging efficiency of the charger

　　During charging, not all of the energy input to the lithium-ion battery is converted into the energy stored in the battery, but a portion is used for internal side reactions and converted into heat during the charging process, so the charging efficiency is always less than 100%.

　　When charging, the charging current should be controlled within a certain range. If the charging current is too large or too small, it will reduce the charging efficiency. For high current fast chargers, special design should be made for the charging method of lithium-ion battery chargers to improve charging efficiency.

　　3. Check the charging termination control of the charger

　　Low current chargers generally use time control. The higher the current supplied by the charger, the more complex the charging termination control method, and the higher the cost and price. For users, they should make choices based on their actual situation.

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