1. How to charge a new battery
It should be noted that in the use of lithium batteries, the battery will enter a dormant state after being left for a period of time. At this moment, the capacity is lower than the normal value, and the use time is also shortened. But the lithium battery is very simple to activate, it only needs to go through 3-5 normal charge and discharge cycles to activate the battery and recover the normal capacity. Due to the characteristics of lithium batteries, it is determined that it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not require special methods and equipment during the activation process. Not only is this true in theory, but from my own practice, it is best to choose a standardized method of charging from the beginning, which is the "natural activation" method.
Regarding the "activation" of lithium batteries, many people say that the charging time must exceed 12 hours, repeated three times to activate the battery. This statement of "charging for the first three times for more than 12 hours" is obviously a continuous statement from nickel batteries (such as nickel-cadmium and nickel-metal hydride). So this statement can be said to be misinformation at the beginning. The charge and discharge characteristics of lithium batteries and nickel batteries are very different, and I can tell you very clearly that all the strict official technical materials I have reviewed emphasize that overcharge and overdischarge will affect lithium batteries, especially liquid lithium Ion batteries cause huge damage. Therefore, it is best to charge in accordance with the standard time and standard method, especially not to charge for more than 12 hours. Generally, the charging method introduced in the mobile phone clarification book is the standard charging method suitable for the mobile phone.
In addition, mobile phones or chargers with lithium batteries will automatically stop charging after the battery is overcharged, and there is no so-called "trickle" charging that lasts for more than 10 hours by nickel battery chargers. In other words, suppose your lithium battery is white charged when it is placed on the charger. And none of us can guarantee that the characteristics of the battery's charging and discharging maintenance circuit will never change and the quality will be foolproof, so your battery will be on the verge of risk for a long time. This is another reason why we oppose long charging.
In addition, on some mobile phones, after charging beyond a certain time, assuming that the charger is not removed, the system will not stop charging at this time, but will also start a discharge-charge cycle. Perhaps the manufacturers of this approach have their own intentions, but it is clearly detrimental to the life of the battery and mobile phone/charger. At the same time, when the long-term charging demand is very long, it is often required to be carried out at night. According to the situation of my country's power grid, the voltage at night in many places is relatively high and fluctuates greatly. As mentioned earlier, lithium batteries are very delicate, and their ability to withstand fluctuations in charge and discharge is much worse than that of nickel batteries, so this brings additional risks.
In addition, another aspect that cannot be ignored is that the same lithium battery is not suitable for over-discharge. Over-discharge is also very detrimental to the same lithium battery. This leads to the following question.
2, when should the charging be started in normal use
We can often see this statement. Since the number of charging and discharging is limited, the battery of the mobile phone should be used up as much as possible to recharge. But I found a test table on the charge and discharge cycle of lithium-ion batteries. The data on the cycle life is listed as follows:
Cycle life (10%DOD):>1000 times
Cycle life (100% DOD): >200 times
where DOD is the abbreviation for depth of discharge. It can be seen from the table that the number of rechargeable times is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that at 100% DOD. Of course, assuming the relative total capacity of actual charging: 10%*1000=100, 100%*200=200, the latter's complete charge and discharge is still better, but the previous netizen's statement needs to be corrected: Under normal conditions, you should reserve and charge according to the principle of recharging when the remaining battery power is used up. However, assuming that your battery is unlikely to last the entire day on the second day, you should start charging in time. Of course you It's a different matter if you are willing to carry the charger to the office.
And you need to charge to cope with the estimated upcoming important events that will cause busy communication, even when the battery has a lot of remaining power, then you just charge it in advance, because you have not really lost "1" charge cycle life The number is "0.x" times, and often this x will be very small.
The principle of recharging when the remaining battery is used up is not to make you go to the extreme. The same as long charging, a widely spread saying is "try to use up the battery of the mobile phone as much as possible, preferably using automatic shutdown." This approach is actually only done on nickel batteries, and the intention is to prevent the recollection effect. Unfortunately, it is also spread on lithium batteries. There was an example where someone still did not charge after the warning of low battery level of the mobile phone was presented, and continued to use it until it turned off automatically. Results The mobile phone in this example had no response during subsequent charging and booting, and had to be sent to customer service for overhaul. This is actually caused by the battery's over-discharge, which causes the voltage to be too low, so that it does not have normal charging and starting conditions.
3, the correct approach to lithium-ion batteries
In the final analysis, my most important reminder for the charging and discharging of lithium battery mobile phones in use is:
①Charge according to the standard time and procedure, even the first three times;
②When the phone battery is too low, you should try to start charging in time;
③The activation of the lithium battery does not require a special method. The lithium battery will be naturally activated during the normal use of the mobile phone. Suppose you insist on using the "first three 12-hour long charge activation" method, which will not be effective in practice.
Therefore, all seeking 12-hour ultra-long charging and using lithium battery mobile phones to automatically shut down are all faults. Assuming that you did it according to the wrong statement, please correct it in time, maybe it is not too late.