Is it useful to continue charging the lithium-ion battery after it is fully charged?

The green light is only an indication. Whether it is fully charged or not depends on the control and judgment of the charging process of the battery by the charger. Take a 4.2V lithium-ion battery as an example to comment on this question. The first is the control, the control of the battery output is first constant current, then constant voltage (the current gradually decreases, and then the judgment, when the judgment current is less than a certain current value, the green light appears, due to the accuracy of the analog-to-digital conversion and its own voltage accuracy It is restricted. The current value of the charger is usually set to 50mA, and the green light appears at the moment, then the battery is indeed less than 10% from its true full charge (according to my test, today's lithium-ion battery is charged at 50mA. If the charging capacity can reach 95%, the charging capacity can be greatly improved. The question now is what the charger is doing next: if it is connected, the charger completely shuts off the charging circuit and does not continue to charge with constant voltage, then put it on the charger. Another 10 hours is a drop in the bucket. Many charging planning methods are like this, such as Fangxin Power’s BQ2057 series of charging chips. The charger continues to charge at constant voltage and strictly controls the voltage to not exceed 4.2V, undoubtedly one more charge Hours, it can indeed increase the capacity of the battery. The charger continues to charge, but its current control is very poor, accidentally causing the battery to exceed 4.2V and continue to run up. Because the lithium-ion battery cannot absorb any overcharge. Continue. Applying current to the battery will result in this result, and then overcharge will occur. This is of course a poorly planned charger, for example, it is more common to recharge lithium-ion batteries and rechargeable nickel-metal hydride batteries. Egg charging. There is also a charging management chip, such as the 1679 chip, which is the same as many mobile phone charging managements. It uses pulse charging. When the green light appears, the lithium-ion battery is 100% fully charged. Of course, place it again. One hour, it will not overcharge, obviously it is doing useless work. Disclaimer: Some pictures and content of the articles published on this site are from the Internet, if there is any infringement, please contact to delete the previous one: How long is the battery life of the car