If your lithium battery is put on the charger after it is complete, it is also charged in vain. And none of us can guarantee that the characteristics of the battery's charge/discharge protection circuit will never change and that the quality is infallible.

　　So your battery will be hovering on the edge of danger for a long time. This is another reason why we are against extended charging.

　　In the experimental table on the charge/discharge cycle of the Li-ion battery, the data on cycle life is listed as follows.

　　Cycle life (10% DOD):>1000 cycles

　　Cycle life (100%DOD):>200 times

　　Where DOD is the abbreviation of the depth of discharge, as seen from the table, the number of rechargeable times is related to the depth of release, and the cycle life at 10% DOD is much longer than that at 100% DOD. Of course

　　If converted to the actual relative total capacity of the charge: 10% * 1000 = 100, 100% * 200 = 200, the latter is still better to fully charge and discharge. But the life of lithium batteries is mainly reflected in the charge and discharge cycle. The cycle is an absolute concept, the last time you use 30% of the power, fully charged, and the next time you use 70% of the power and are fully charged, this is just a charging cycle. Therefore, it is better to follow the slogan of the inventor of the lithium battery, "use that is charged, that is charged that is used" method of using lithium batteries.

　　Over-charging and completely emptying the battery will cause over-charging and over-discharging, which will cause permanent damage to the positive and negative electrodes of lithium-ion batteries. From the molecular level, over-discharging will lead to excessive release of lithium ions from the negative carbon and make its lamellar structure collapse; over-charging will put too many lithium ions into the negative carbon structure and make some of the lithium ions can no longer be released. This is the reason why lithium-ion batteries are usually equipped with charge and discharge control circuits. Lithium-ion batteries generally have a management chip and a charge control chip. The management chip has a series of registers that hold the capacity, temperature, ID, charge status, discharge count, and other values. These values will gradually change in use. The main purpose of the "use about a month should be fully charged and discharged once" practice in the instructions for use should be to correct the improper values in these registers so that the charge control and nominal capacity of the battery match the actual situation of the battery. The power statistics chip can calculate the power of the battery by recording the discharge curve (voltage, current, time) on a sample basis. If the chip does not have a chance to read out a complete discharge curve again, the calculated power is not accurate. So we need to deep charge and discharge to calibrate the battery chip.

　　The correct method of charging the first three times of Li-ion batteries and the precautions for daily use.

　　There is no need to charge the battery for an extraordinary period of time, such as 12 hours, to activate the battery during the first three charges, the charging circuit is already protected, and it is useless to plug it in.

　　The process of regular use should avoid complete discharge (use to black screen power off).

　　Long time placed unused, or frequent that is charged that is used after a while, the method is a complete charge and discharges after the battery can be used that is trusted, only after a long period of use need to be fully charged and rereleased to recalibrate.

　　If you want to long between a battery is not used, it is recommended to charge to 40% and then place it to protect the battery.

　　Finally, the life of the lithium battery is mainly reflected in the charge and discharge cycle. The cycle is an absolute concept. The last time you use 30% of the power, fully charged, and the next time you use 70% of the power fully charged, this is just a charging cycle.

　　Understanding the above lithium battery charger, you are not the lithium battery to understand. And the need for lithium battery chargers, etc. to find Isai Electronics, our company specializes in lithium battery chargers and electric car chargers, etc.