At present, the batteries used in mobile phones on the Chinese market have completed the transition from nickel hydrogen nickel cadmium batteries to lithium batteries, but most people still use lithium batteries in the old and incorrect way of using nickel hydrogen nickel cadmium batteries. This article provides a detailed explanation of the correct usage of lithium batteries, which are currently the most widely used batteries. The number of people who have made mistakes in their usage was sampled and statistically analyzed, with a focus on the correct method of charging lithium batteries for mobile phones in the first three times.

Steps/Methods 
Since its introduction in 1990, lithium-ion batteries have experienced rapid development and are widely used in society due to their outstanding performance. Lithium ion batteries have rapidly occupied many fields with unparalleled advantages over other batteries, such as well-known mobile phones, laptops, small cameras, etc., and more and more countries are applying this battery for military purposes. The application shows that lithium-ion batteries are an ideal small green power source.
The superiority of lithium-ion batteries that we often talk about is related to traditional nickel cadmium batteries (Ni/Cd) and nickel hydrogen batteries (Ni/MH). It has the advantages of high working voltage, high specific energy, long cycle life, low self discharge rate, and no memory effect.
The currently recognized basic principle of lithium batteries is the so-called "rocking chair theory". The charging and discharging of lithium batteries are not achieved through traditional methods of electron transfer. In childhood, energy changes occur through the entry and exit of lithium ions in the crystals of layered materials. Under normal charge and discharge conditions, the entry and exit of lithium ions generally only cause changes in interlayer spacing, without causing damage to the crystal structure. Therefore, from the perspective of charge and discharge reactions, lithium-ion batteries are an ideal reversible battery. During charging and discharging, lithium ions move back and forth between the positive and negative electrodes of the battery, just like a rocking chair swaying back and forth between the positive and negative electrodes. Therefore, some people refer to lithium-ion batteries as rocking chair batteries.
2. Misconceptions in the daily use of lithium batteries. For the issue of "activation" of lithium batteries, many opinions suggest that the charging time must exceed 12 hours and be repeated three times in order to activate the battery. The statement that 'the first three charges should be charged for more than 12 hours' is clearly a continuation of nickel batteries such as nickel cadmium and nickel hydrogen. So this statement can be said to have been a misconception from the beginning. After a sampling survey, it can be seen that a considerable number of people have confused the charging methods of the two batteries.
There is a significant difference in the charging and discharging characteristics between lithium batteries and nickel batteries. All the serious formal technical materials reviewed emphasize that overcharging and overdischarging can cause huge damage to lithium batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge according to standard time and methods, especially not for over 12 hours of ultra long charging.
Usually, the charging method described in the phone manual is the standard charging method suitable for the phone.
In addition, lithium battery phones or chargers will automatically stop charging after the battery is fully charged, and there is no so-called "trickle" charging that lasts for more than 10 hours with nickel chargers. That is to say, if your lithium battery is fully charged and placed on a charger, it will still be charged for nothing. 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 hovering on the edge of danger for a long time. This is also another reason why we oppose long charging.
3. Regarding the experimental table of lithium-ion battery charging and discharging cycles, the data on cycle life is listed as follows:
Cycle life (10% DOD):>1000 cycles
Cycle life (100% DOD):>200 cycles
DOD stands for Depth of Discharge. From the table, it can be seen that the number of rechargeable cycles is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that at 100% DOD. Of course, if converted to the actual relative total charging capacity: 10 * 1000=100, 100 * 200=200, the latter's complete charging and discharging is still better. However, the lifespan of lithium batteries is mainly reflected in the charging and discharging cycle, which is an absolute concept. The last time they used 30% electricity, they were fully charged, and the next time they used 70% electricity, they were fully charged again. This happens to be a charging cycle. So we still follow the slogan of the inventor of lithium batteries, 'Charge and use immediately, charge and use immediately', when using lithium batteries.
4. Excessive charging and complete depletion of battery life can lead to overcharging and overdischarging, causing permanent damage to the positive and negative electrodes of lithium-ion batteries. From a molecular perspective, overdischarging can cause excessive release of lithium ions from the negative carbon, leading to the collapse of its layered structure. Overcharging can force too many lithium ions into the negative carbon structure, making it impossible for some of them to be released. This is also why lithium-ion batteries are usually equipped with control circuits for charging and discharging. Lithium ion batteries generally come with a management chip and a charging control chip. The management chip contains a series of registers that store capacity, temperature ID 、 The charging status, number of discharges, and other numerical values will gradually change during use. The practice of "fully charging and discharging once every month or so" in the instructions should mainly be used to correct inappropriate values in these registers, so that the charging control and nominal capacity of the battery match the actual situation of the battery. The power statistics chip can sample and calculate the battery's power by recording the discharge curve (voltage, current, time), which is the why value we read in Battery Information. However, lithium-ion batteries will change their discharge curve after multiple uses. If the chip does not have the opportunity to read a complete discharge curve again, the calculated power will be inaccurate. Therefore, we need deep charging and discharging to calibrate. The chip of the battery
5. Correct methods for the first three charges of lithium batteries and precautions for daily use.
There is no need to charge the battery for an extended period of time, such as 12 hours, to activate it during the first three charges. The charging circuit is already protected and it is useless to plug it in.

During regular use, complete discharge should be avoided (until the black screen is turned off).
After being left unused for a long time or frequently charged and used for a period of time, the method is to fully charge and discharge the battery once, and then the battery can be charged immediately. Only after a long period of use does it need to be fully charged and discharged again for recalibration.
If a long battery is not needed, it is recommended to charge it to 40% before placing it to protect the battery.
Finally, the lifespan of lithium batteries is mainly reflected in the charging and discharging cycle, which is an absolute concept. The last time they used 30% electricity, they were fully charged, and the next time they used 70% electricity, they were fully charged again. This happens to be a charging cycle.