Detailed explanation of the use of lithium batteries

1. How to charge a new battery. When using lithium batteries, it should be noted that the battery will enter a dormant state after being left for a period of time. At this time, 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 35 normal charge and discharge cycles to activate the battery and recover its normal capacity. Due to the characteristics of the lithium battery itself, it is determined that it has almost no recall 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 in theory, but from my own practice, it is best to choose a standardized method of charging from the beginning, which is a natural activation method. Regarding the activation of lithium batteries, many claims are: the charging time must exceed 12 hours, repeated three times in order to activate the battery. This statement that the first three charges should be charged for more than 12 hours is obviously continued from nickel batteries (such as nickel-cadmium and nickel-metal hydride). Therefore, 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 they can tell you very clearly that all the rigorous official technical materials I have reviewed emphasize that overcharge and overdischarge will affect lithium batteries, especially liquid lithium. The battery causes great damage. Therefore, it is best to charge in accordance with the standard time and method, especially not to charge more than 12 hours. Generally, the charging method analyzed in the mobile phone manual 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. There is no such thing as a trickle charge of nickel battery chargers that continues for more than 10 hours. In other words, if your lithium battery is overcharged, it will be white charged on the charger. And none of us can ensure 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 at the margin 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, if the charger is not removed, the system will not only stop charging at this time, but also start a discharge-charge cycle. Perhaps the manufacturers of this approach have their own intentions, but it is clearly detrimental to the lifespan of the battery and mobile phone/charger. At the same time, long-term charging needs to be carried out at night for a long time. 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 shaking in terms of charging and discharging is much worse than that of nickel batteries, so this brings additional risks. In addition, another aspect that cannot be ignored is that lithium batteries are not suitable for over-discharge. Over-discharge is also unfavorable for lithium batteries. This leads to the following question. 2. When should the charging be started in normal use? On our forums, 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 about charging and discharging cycles of lithium batteries. The data about cycle life is listed as follows: Cycle life (10%DOD):u003e1000 cycles Cycle life (100%DOD):u003e200 times of which DOD It is the abbreviation of 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, if it is converted to the relative total capacity of actual charging: 10%*1000u003d100, 100%*200u003d200, 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 the battery according to the remaining battery charge and recharge the standard, but if your battery cannot last the entire day on the second day, you should start charging in time. Of course, if you Is willing to carry the charger to the office is another matter. And when you need to charge to cope with the important event that is estimated to cause busy communication, even when the battery has a lot of remaining power, then you only need to charge it in advance, because you have not really lost the life of one charging cycle. It is only 0.x times, and often this x will be very small. The criterion for recharging when the remaining battery power is used up is not to make you go to extremes. The same as long charging, a widely spread saying is to use up the battery of the mobile phone as much as possible, and it is best to use automatic shutdown. This approach is actually only done on nickel batteries, and the intention is to guard against recall effects. Unfortunately, it is also spread on lithium batteries. Once there was a warning that the battery of the mobile phone was too low, but they still did not charge and continued to use the example of automatic shutdown that has always been used. As a result, the mobile phone in this example did not respond during subsequent charging and booting, and had to be sent to customer service for overhaul. In fact, this is 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. 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. Previous: About the life of polymer lithium battery