The right way to charge the lithium battery of your phone for the first time

In general, when a mobile phone is bought, it will have some power, because the lithium battery has a certain amount of power when it leaves the factory, so it can be used immediately, and it does not have to be charged before use. From the theoretical and practical point of view, lithium battery charges for the first time "with then charge" or "charge and then use" exactly the same effect. There is a limit here. It is best to charge the factory date for more than half a year, because the battery is too low. Some lithium batteries have the first three lithium batteries, and the mobile phone lithium batteries activate the batteries. In fact, these activations do not need to be deliberately done. After the first three charge and discharge, the lithium battery and the lithium battery are basically restored to the best state. When the lithium battery is fully charged for the first time, the lithium battery can be removed from the charger. The lithium battery does not have the "activation" problem when it is used for the first time. So does the lithium battery and the nickel hydrogen battery. There is a big difference in charge and discharge characteristics. If the battery is overcharged, it will cause great damage to the lithium battery, lithium battery, and lithium ion battery. Therefore, continuous charging will cause excessive overcharge of the battery. When charging the lithium battery for the first time, after it is fully charged, separate the lithium battery from the charger. Lithium batteries will automatically stop charging after being filled (temporary), because lithium batteries have protection against PMC protection, and there is no "continuous" long-term trickle charge, which is the difference between lithium batteries and nickel-metal hydride batteries. Therefore, we need to pay attention when charging.

The correct use of lithium batteries

Although lithium batteries are widely used, they are used in automobiles, electric vehicles, mobile phones, tablets, notebooks, etc. In the near future, there may be more equipment to use it, but at present, mobile phones and tablets, etc. The device is still the closest lithium battery powered device to us. Therefore, it is necessary to make special instructions for the mobile phone lithium battery.

1, charging

In the use of lithium batteries, it should be noted that after the battery is placed for a period of time, it enters a sleep state. At this time, the capacity is lower than the normal value, and the use time is also shortened. However, the lithium battery is easy to activate, as long as the battery is activated after 3 to 5 normal charge and discharge cycles, and the normal capacity is restored. Due to the characteristics of the lithium battery itself, 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 in theory, but from my own practice, it is best to use a standard method of charging this "natural activation" method from the beginning. For the "activation" problem of lithium batteries, there are many sayings: charging time must be more than 12 hours, repeated three times in order to activate the battery. This statement that "the first three charges have to be charged for more than 12 hours" is obviously a continuation of nickel batteries (such as nickel cadmium and nickel hydride). So this kind of statement can be said to be misinformation at the beginning. The charge and discharge characteristics of lithium and nickel batteries are very different, and it is very clear to tell you that all the serious formal technical information I have reviewed emphasizes that overcharge and over discharge will make lithium batteries, especially liquid lithium. Ion batteries cause great damage. Therefore, charging is preferably done in accordance with standard time and standard methods, especially for ultra-long charging of more than 12 hours. Usually, the charging method described in the mobile phone manual is a standard charging method suitable for the mobile phone.

In addition, the lithium battery phone or charger will automatically stop charging after the battery is fully charged, there is no so-called “turbulent” charging that the nickel battery charger has for 10 hours. In other words, if your lithium battery is full, it will be white charger 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 edge of danger for a long time. This is another reason why we oppose long charging. In addition, on some mobile phones, after charging for more than a certain period of time, if you do not remove the charger, then the system will not stop charging, and will start the discharge-charge cycle. Perhaps the manufacturer of this approach has its own purpose, but it is clearly unfavorable for the life of the battery and the phone/charger. At the same time, long charging takes a long time and often needs to be carried out at night. In the case of China's power grid, the voltage at night is high in many places and fluctuates greatly. As mentioned earlier, lithium batteries are very delicate, and they are much less resistant to fluctuations in charge and discharge than nickel, which in turn poses additional risks. In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for over-discharge, and over-discharge is also disadvantageous for lithium batteries. This leads to the following problem.

2. When should I start charging during normal use?

In the forum, you can often see this statement, because the number of charge and discharge is limited, so the battery power of the mobile phone should be recharged as much as possible. But find an experimental table on the charge and discharge cycle of lithium-ion batteries. The data on cycle life are listed below:

Cycle life (10% DOD): >1000 times

Cycle life (100% DOD): >200 times

Among them, DOD is the abbreviation of depth of discharge. As can be seen from the table, the number of chargeables is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that of 100% DOD. Of course, if it is converted to the relative total capacity of the actual charge: 10% * 1000 = 100, 100% * 200 = 200, the latter's full charge and discharge is still better. Under normal circumstances, you should have the reserve to charge according to the principle that the remaining battery power is used up and recharge, but if the battery is not expected to hold the whole day during the second day, you should start charging in time, of course, if you are willing to charge It’s a different matter to go to the office. And when you need to charge to cope with the expected important events that will cause the communication to be busy, even if the battery still has a lot of power, then you only charge in advance because you have not really lost the "1" charge cycle life. It is only "0.x" times, and often this x will be small. The principle of recharging the remaining battery power is not to go to extremes. One of the more widely spread sayings like long charging is that "try to run out of battery power, it is best to use automatic shutdown." This practice is actually only a nickel battery, the purpose is to avoid the memory effect, unfortunately, it is also circulating on the lithium battery. Someone has used the example of automatic shutdown since the warning of the low battery level of the mobile phone is still not used. As a result, the mobile phone in this example did not respond during the subsequent charging and booting, and had to be sent to the customer service for repair. This is actually caused by the battery being over-discharged and the voltage is too low, so that it does not have normal charging and power-on conditions.

3. Important tips for the correct use of lithium battery mobile phones

To sum up, my most important tips on the charging and discharging problems of lithium battery mobile phones in use are:

1. Charge according to standard time and procedures, even if it is the first three times;

2. When there is a low battery power prompt, you should start charging as soon as possible;

3. The activation of the lithium battery does not require a special method. The lithium battery will naturally activate during normal use of the mobile phone. If you insist on using the "first three 12-hour long charge activation" method, it will not actually work. Therefore, all the pursuit of 12 hours of ultra-long charging and the use of lithium battery mobile phones to automatically shut down are wrong. If you have done it in the wrong way, please correct it in time, maybe it is not too late. Of course, in the case of good quality of the mobile phone and charger protection and control circuit, the protection of the lithium battery is quite guaranteed. So the understanding of the charging rules is the focus, and in some cases it is also possible to make some concessions. For example, if you find that your phone must be charged before you go to sleep at night, you can also start charging before going to bed. The point is that you should know what the right approach is and don't deliberately follow the wrong way.

Second, battery maintenance

In fact, there is not much use in the battery to pay attention to, in other words, it is not too much to consider. How many times a battery can be used, the difference is more from the individual differences in the manufacture of the battery itself, rather than the method of use. In addition to its own battery quality, the life of the battery itself is limited. Once the battery is off the production line, its life begins to pass. Lithium batteries last for only two to three years, whether you use them or not. One of the important reasons for the drop in battery capacity is the increase in internal resistance due to oxidation. Finally, the cell resistance reaches a certain point. Although the battery is fully charged, the battery cannot release the stored amount. Many friends think that the first use of lithium batteries should be charged for more than 16 hours, so that the battery can be fully activated. In fact, this is not based on this. This is just the charging method of nickel-hydrogen or nickel-cadmium batteries that were popular in the past. Not applicable. Because this lithium polymer-based battery has no memory effect in theory, even if it is, it is completely negligible. So it only takes about 3 hours to rush. If the display is completed and you don't need an external power supply, you can unplug it and you don't have to wait for such a long time.

Myth 1: The PSP needs to be charged and discharged three times in order to activate the battery. Unless the PSP is a product that has been in stock for more than one year, you don't need to do this because the current battery cell is activated at the factory, and the battery is equivalent to activation when it is packaged into a PSP battery. The test, so the battery you got the hand has already been activated, and then doing the three charge and discharge process is just a wasteless increase in battery consumption.

Myth 2: The first charge must be charged for 12 hours. This is suitable for early NiMH battery devices without battery control circuits, but it is a joke for PSPs with intelligent charge and discharge control modules. When the PSP battery is fully charged, the charging current is automatically cut off and the system displays as “External Power”. Even if you continue to charge for 120 hours, the state will not change. In general, 3 hours is completely full, and the remaining "charging" is just a waste of your time. Instead, when you get a new machine, you should first discharge the battery and recharge it.

Myth #3: The battery needs to be fully charged and discharged once a month. For nickel-hydrogen batteries with strong memory effects, this is a must, but for lithium batteries, this cycle is too frequent. Lithium batteries theoretically eliminate memory effects, and even if they do, they have greatly reduced negligible To the extent that you use the battery very often, then you should discharge the battery to a lower level (about 10~15%) and recharge it, but if it is discharged even if the machine can't be turned on (0~1%), it belongs to the lithium battery. Deep discharge with large damage is generally done once every 2 months. If you rarely use the battery, you only need to do this every 3 months.

Myth 4: Working while charging, or continuing to use external power after charging will damage the main unit and battery. This is the most ridiculous argument. The theoretical arguments of the so-called hole electrons, sub-charges and other mechanisms can get much reaction in practice. The battery industry academics firstly do not agree on this. The theory still has differences. How to guide consumers to use the actual battery? The loss of the battery is divided into normal loss and damage loss. The actual power consumption and the degree of loss caused by the use of the external power supply are completely within the normal loss range of the battery. That is to say, no matter how systematic the theoretical maintenance measures are taken, the battery will age, which is like how magical cosmetics and maintenance can not prevent the beauty from becoming an old woman, at most only delay, but the surface of the whitewash How much real utility can be, this is by no means a theory can explain - respecting the actual use of experience is the correct and scientific view of knowledge. Some people may say that the only way to avoid battery aging is not to use it (so many people choose to take the battery down), but this makes the PSP portability meaningless. Second, even if the battery is in the sealed state, it will be over time. Extended and naturally aging. The battery is actually a semi-consumable product. As long as the battery brings you enough convenience and happiness, I think their sacrifice is valuable.