Because of the chemical reaction inside the battery, discharge at less than 20% of the remaining power or charge at more than 80% of the capacity of the battery will be a big loss. Therefore, keeping the lithium-ion battery between 20% and 80% of its power can help reduce battery wear and maintain the battery's high capacity for long periods of time. And never let your phone stay charged for long periods of time, especially on a laptop. Regular charging and discharging helps keep the battery in better working condition. Charging and recharging once a month can effectively extend the life of the battery.