If your lithium battery is fully charged, it is also white charged on the charger. And none of us can guarantee that the characteristics of the battery's charge and discharge protection circuit will never change and the quality will be foolproof.
So your battery will be on the verge of danger for a long time. This is another reason why we oppose long charging.
In the experimental table on the charge and discharge cycle of lithium-ion batteries, the data on the cycle life are listed as follows:
Cycle life (10%DOD):>1000 times
Cycle life (100%DOD):>200 times
The life of a lithium battery is mainly reflected in the charge-discharge cycle. This cycle is an absolute concept. The last time I used 30% of the power, it was fully charged, and the next time I used 70% of the power, it was fully charged. This is just a charging cycle. . Therefore, the lithium battery is still used in accordance with the slogan of the inventor of the lithium battery, "charge and use".
Charging in an abnormal time and completely using up the power will cause overcharging and over-discharging, which will cause permanent damage to the positive and negative electrodes of the lithium-ion battery. From the molecular level, over-discharge will cause the negative carbon to excessively release lithium ions and make the film The layer structure collapses. Overcharging will hardly squeeze too many lithium ions into the carbon structure of the negative electrode, and some of them can no longer be released. This is why lithium-ion batteries are usually equipped with charging and discharging control circuits. reason. Lithium-ion batteries generally have a management chip and a charge control chip. Among them, there are a series of registers in the management chip, which store values such as capacity, temperature, ID, charge status, and discharge times. These values will gradually change during use. Instructions for use The main effect of the "full charge and discharge once a month or so" approach, should be to correct the inappropriate values in these registers so that the battery charging control and the nominal capacity match the actual situation of the battery. The power statistics chip records the discharge curve (Voltage, current, time) that can be sampled to calculate the battery capacity. The discharge curve of lithium-ion batteries will change after multiple uses. If the chip has not had the opportunity to read a complete discharge curve again, it will be calculated The power is also inaccurate. So we need to deep charge and discharge to calibrate the battery chip.
The correct method for the first three charging of lithium batteries and the precautions for daily use.
There is no need to charge the battery for an abnormal time such as 12 hours to activate the battery during the first three times of charging. The charging circuit is inherently protected, and it is useless to plug it in.
During normal use, avoid complete discharge (power off when the screen is black).
After being left unused for a long time, or after frequent charging and using for a period of time, the method is to fully charge and discharge the battery once, and then the battery can be charged immediately after use. Only after a long time of use, it needs to be fully charged and discharged again, and re-calibrated.
If a battery is not used for a long period of time, it is recommended to charge it to 40% before placing it in order to protect the battery.
Finally, the life of a lithium battery is mainly reflected in the charging and discharging cycle. This cycle is an absolute concept. The last time I used 30% of the power and was fully charged, the next time I used 70% of the power and was fully charged, this is just one Charging cycle.
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