Is it normal for the mobile phone to get hot when charging?

Question 1: Is the fever normal when the mobile phone and charger are charged? What shall we do? Jianjun is honored to answer your question. It is normal for a mobile phone to get hot when charging. Just pay attention to the time, usually three or four hours. Just turn off the phone when charging, because the switch will have current and be unstable, so there will be a problem of burning the phone or battery, which can avoid electromagnetic radiation to the maximum extent.

During the trip, or afraid of delaying the call, many friends will use the travel charger to turn on the phone when the phone is dead. Charging in the boot state, as long as you don't operate the phone, there will be no adverse effects. However, if you answer the phone, send text messages, download CRBT, MMS and play games online, it will be harmful to your mobile phone, people and batteries. There are three reasons: first, the voltage of the mobile phone is higher when charging than when it is in standby. If you answer the phone and make a call at the same time, the voltage at the moment of talking or connecting to the network will be many times higher than usual, which is easy to damage the sensitive parts inside the mobile phone. Secondly, it goes without saying that while using the mobile phone while charging, the radiation amount is dozens of times that of usual. Thirdly, because the service life of the battery is calculated according to the charging and discharging cycle, the charging times directly affect the battery life. If the power supply is unplugged many times during charging, the service life of the battery will be shortened due to repeated charging and discharging. Therefore, don't answer the phone when using the travel charger when the mobile phone is turned on. If you have to answer an important phone call, it is recommended to use another phone to call back.

1, how to charge the battery?

In the use of lithium batteries, it should be noted that after a period of time, the battery will enter a dormant state, when the capacity is lower than normal, and the use time will be shortened. However, the lithium battery is easy to activate, and it can be activated after 3-5 cycles of normal charge and discharge, and the normal capacity can be restored. Because of the characteristics of lithium battery itself, it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not need special methods and equipment in the activation process. Not only in theory, but also from my own practice, it is best to charge this "natural activation" way in a standard way from the beginning.

For the "activation" of lithium batteries, there are many sayings: the charging time must exceed 12 hours, and it must be repeated three times before the battery can be activated. This statement that "the first three charges should last more than 12 hours" is obviously a continuation from the statement of nickel batteries (such as nickel cadmium and nickel hydrogen). So this statement can be said to have been misinformed from the beginning. The charging and discharging characteristics of lithium batteries and Ni-MH batteries are very different. It can be clearly told that all the serious and formal technical materials I have consulted emphasize that overcharge and overdischarge will cause great harm to lithium batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge in a standard time and manner, especially not more than 12 hours. Usually, the charging method introduced in the mobile phone manual is the standard charging method suitable for this mobile phone.

In addition, the mobile phone or charger of lithium battery will automatically stop charging after the battery is fully charged, and there is no so-called "trickle charging" in which the nickel charger lasts 10 hour. In other words, if your lithium battery is fully charged, it is also charged in vain on the charger. 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 verge of danger for a long time. This is another reason why we oppose long-term charging.

In addition, for some mobile phones, if the charger is not removed after charging for a certain period of time, the system will not only stop charging, but also start discharging-charging cycle. Perhaps the manufacturer's practice has its own purpose, but it is obviously unfavorable to the life of batteries and mobile phones/chargers. At the same time, it takes a long time to charge, often at night, but according to the situation of China power grid, the voltage in many places is relatively high at night and fluctuates greatly. As mentioned earlier, lithium batteries are very expensive, and their ability to withstand charging and discharging fluctuations is much worse than that of nickel batteries, which brings additional dangers.

In addition, another aspect that can not be ignored is that lithium batteries are not suitable for overdischarge, and overdischarge is also very unfavorable to lithium batteries. This raises the following questions.

2. When should I start charging for normal use?

In our forum, we can often see this statement, because the number of charging and discharging is limited, so we should use up the battery of the mobile phone as much as possible before recharging. But I found an experimental table about the charge-discharge cycle of lithium-ion batteries, and the data about the cycle life are listed as follows:

Cycle life (10% DOD): >; 1000 times

Cycle life (100% DOD): >; 200......& gt& gt

Question 2: Is it normal for the newly bought mobile phone to burn out after charging? It is normal to charge and heat. It's not normal to put it on your body, such as a smart phone. Did you surf the internet, hang up Q or open many programs or something? Check it yourself first, or go to the maintenance service.

Question 3: The mobile phone is hot when charging. What happened? Hello:

-1, the battery has internal resistance, so does the rechargeable battery ... The internal resistance of the new battery is very small, but the internal resistance of the old battery or the new battery that has been left for a long time will increase.

-2. If the charging current passes through the internal resistance of the battery, it will consume power, and the power is: the square of current × internal resistance. Therefore, the phenomenon that "the mobile phone becomes very hot when charging" appears, which is the reason why the internal resistance of the battery becomes larger.

-3. "I changed another original battery, but this battery will become very hot after a few days of charging", which also shows that the mobile phone is normal and it is a battery problem. Battery replacement: Note that when buying a battery, choose a product with a near production date. The newer the better, because the newly produced battery has small internal resistance and relatively long service life.

Question 4: Is it normal for a new mobile phone to heat up every time it is charged? It is normal for a mobile phone to get hot when charging, because it is related to the environment when there is current flowing.

In that case, you can put it in a cool place.

It may also be that there are many programs running on your mobile phone at this time.

It will also cause the phone to burn, which can be cleaned with cleaning software.

Just use Tencent mobile phone housekeeper, which can clean up the background software well.

Free memory to reduce fever.

If it is always hot, it may be that the motherboard is broken and it is necessary to change the mobile phone.

Question 5: Why is the new mobile phone very popular? Yes, there are some smart phones now, which is normal. If it is too hot, send it for after-sales inspection.

Question 6: Why does the mobile phone get hot when charging? It's all hot. Will it be easy to break your mobile phone? Landlord, this is a normal phenomenon, don't care too much.

Smartphones get hot when charging, and Android seems to be more serious.

The key is that the landlord should not use his mobile phone to brush Weibo, WeChat, QQ, games and so on when charging.

Just let it fill quietly, and then pull it out.

When the phone is fully charged, it should be * * *.

Question 7: Is it normal for a mobile phone to charge without fever? If the phone doesn't heat up after charging, it means that the quality of your phone is very good. However, it does not rule out that touching the mobile phone will not feel hot when the palm temperature is high.

Question 8: What's wrong with charging and heating the mobile phone? It is normal to have a fever, but you should pay attention to excessive fever. The standard of exceeding the standard is that the hand will feel very hot! We know that the battery is the power of the mobile phone. Without battery power supply, the mobile phone is a piece of scrap iron, a high-capacity and high-performance battery, which can not only give the mobile phone a long-term endurance, but also protect the circuit of the mobile phone and make it work efficiently for a long time, otherwise it is likely to cause unexpected damage to the mobile phone. For us players, the performance of the battery has been determined when it leaves the factory. Its power and performance are determined by the battery itself. In this respect, we can't change it artificially, but this doesn't mean that we can't do anything after we get the battery. Mobile phones use lithium-ion rechargeable batteries. When the used memory runs out, it needs to be recharged to replenish the power supply. Don't underestimate the link of charging. A good charger and correct charging method can keep the standby time of the battery longer and prolong the service life of the battery. Moreover, it can also protect the mobile phone. On the method of how to charge, players often ask in the forum. After a period of practical use and reference, I summarized the following points:

1. Generally, lithium batteries are activated and precharged by the manufacturer before leaving the factory, so the batteries are fully charged. The newly bought mobile phone battery is lithium ion, so the first 3~5 times of charging is called the adjustment period, and it should be charged for more than 14 hours to ensure the full activation of lithium ion. Lithium-ion batteries have no memory effect, but they have strong inertia. It should be fully activated to ensure the best performance in future use. Regarding the first charge, I also consulted Samsung's technicians, and the answer was that Samsung's original battery was fully activated before leaving the factory, and it was not necessary to charge for a long time to activate the activity of lithium ion. When charging for the first time, you only need to fully charge the remaining power in the battery. I think what Samsung technicians said should be convincing.

2. Some automatic intelligent fast charging actually only displays 90% full when the signal light changes. The charger will automatically change to a slow speed to charge the battery. Don't cut off the power of the charger immediately. It is best to charge the battery for a period of time before using it, otherwise it will shorten the use time.

3. Before charging, the lithium battery does not need to be discharged, nor can it be discharged. At present, the charger of lithium battery has no discharge function. If the charging speed can be adjusted, I suggest you charge slowly and reduce the fast charging mode. Do not charge slowly or quickly for more than 24 hours. Otherwise, the battery is likely to burn out due to the huge electron flow generated by long-term power supply.

Many users leave their mobile phones on when charging. In the process of charging, the battery discharges outward because of the use of the mobile phone, and supplies power inward because of the charging of the battery, which is easy to cause voltage disorder and cause the circuit board of the mobile phone to heat up. If there is an incoming call, it will generate instantaneous backflow current, which will damage the internal parts of the mobile phone.

5. The life of the battery depends on the number of times of repeated charging and discharging. The lithium battery can be continuously charged and discharged for about 500 times, after which the performance of the battery will be greatly weakened. We should try to avoid discharging all the remaining power in the battery before charging, otherwise, with the increase of charging times, the performance of the battery will gradually weaken and the standby time of the battery will be difficult to decrease.

6. Don't expose the battery to high temperature or cold places, such as dog days, and don't expose the mobile phone to the sun; Or take it to an air-conditioned room and put it in a place where the cold wind blows directly. When charging, the current product refluxes, and it is normal for the battery to get a little hot.

7. If the mobile phone battery is idle for too long, it is best to apply to the mobile phone maintenance department for activating the battery. You can also use a DC constant voltage device to adjust the voltage to 5~6V and the current to 500~600mA, and connect the battery in reverse. Note: hair-trigger, repeat up to three times. After this treatment, the original charger is used for "adjustment period" charging.

8. The longer the charging time, the better. Stop charging the battery without protection circuit after it is fully charged, otherwise the performance will be affected by heat or overheating. The theoretical charging time of the battery is calculated as follows: the battery capacity can be divided by the output current of the charger. For example, for a battery with a capacity of 800 mA, if the output current of the charger is 500 mA, the charging time is equal to 800 mA /500 mA ... >; & gt

Question 9: Why does the charger head of mobile phone get hot? Normal or not? It is normal that the charging head will heat up when the mobile phone is charging.

Just pay attention to the time, usually three or four hours. It is best to turn off the mobile phone when charging, because the switch will have current and be unstable, so there will be problems of burning the mobile phone or battery, so as to avoid electromagnetic radiation to the maximum extent.

However, if it is extremely hot, it is necessary to check whether the circuit is faulty or the original charging head is not used, resulting in fever, and then solve them one by one.

Question 10: How does the charger burn when charging a mobile phone? The mobile phone is not hot. If it is not very hot, it will burn.

It doesn't matter, the inverter converts AC power into DC.

Fever is normal.

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