Why does the charger get so hot? The phone gets very hot when locked or while charging, is this normal? Possible problems if the battery gets very hot when charging

The charger gets hot and got the best answer

Answer from Yergey[guru]
Lately this is when, with the onset of summer? When did the heat start?
Chargers get hot, sometimes quite hot, this is normal. Pay attention to the time it takes to fully charge, if it hasn’t changed so much that it becomes noticeable and the charge stays about the same as it should, then everything is in order.
It smells like plastic if you sniff it and it smells a little - that’s also okay, especially if it’s relatively new. Do not keep the charger in direct sunlight while working.
If the charging time and battery life have not changed, then everything seems to be in order.
But still, do not leave the charger and other emails on. devices unattended.

Reply from Qwe[guru]
The starter can get hot, but it shouldn't smell

Reply from GT[guru]
no, this is not normal, at most it should be warm

Reply from Petrovich[guru]
Change your phone battery

Reply from Kirill kirill[newbie]
Chargers come in different capacities, of different quality, and that is why a heating battery or charger is normal. Sometimes the charger itself heated up to such temperatures that it seemed like it would start to burn. Remember the physics lesson, each conductor will heat up from the resistance voltage and current, and if you charge a phone (smartphone) that is not completely discharged, then the residual charge in the battery gives strong resistance and charging charges, but the charging or battery unit will heat up very much. So try it Charge the phone when it turns off, and everything will be okay.

In ours, we looked at the reasons why a smartphone can get warm. Now we will try to answer the main questions of puzzled users about why their phone gets hot while charging.

We asked some specialists working in mobile equipment repair service centers to comment on this problem. Below are the main thoughts on this matter:

Answers from experts

• If overheating is not observed (the phone is slightly warm), then there is no particular reason to worry - any smartphone and battery heats up while charging.
• If you use your phone while charging, this will accordingly be reflected in its temperature. Just accept it as given or put the phone aside until it is fully charged, then continue to use it as usual.
• If the smartphone has metal body, the problem of “overheating” may be far-fetched - it is clear that the plastic case will have lower thermal conductivity, but in neither case will the problem be critical.
• If Wi-Fi or mobile Internet is turned on and data is downloading(auto-updates for applications are enabled), this may affect the charging temperature more than the charging process itself.
• Charge your phone with original charger or charging with parameters close to those set by the manufacturer for your mobile phone.
• Firmware. Sometimes, due to an error in the software code of the smartphone operating system (Android, iOS) or shell (manufacturer add-ons based on Android), heating problems may occur during charging for some smartphone models. In this case, you need to look for the current firmware version (if you have an old one), or roll back to a version with no problems (if it’s new). Or you can just wait for the new version and see if the problem is resolved after the update.

You can check the temperature of your smartphone while charging using an application like CPU-Z.

The fact that the laptop power supply heats up when charging should not confuse you - this is normal. Another question is if the power supply gets very hot and does not cool down after the battery is fully charged. Let's see why this happens and what to do to prevent your laptop from suffering from overheating.

Reason for heating

The reason that the laptop power supply gets very hot when charging is the underrated power of the adapter. The more powerful the adapter, the less it heats up when charging. But with an increase in power, the size of the power supply will become larger, which negatively affects users’ perception of the laptop.

Therefore, manufacturers select an adapter with the minimum permissible power for the laptop kit. You can charge the laptop, but don’t be surprised that it gets very hot – the adapter has to work at maximum speed.

The block converts alternating current 220V into direct current 15-24V. The conversion is carried out by a transformer, and rectification is carried out by a diode bridge. Depending on the magnitude of the electrical load, both units heat up with varying degrees of intensity during operation.

Typically, maximum heating occurs during the first 20-30 minutes of operation of the laptop with the power supply connected. This is due to the fact that the adapter operates under maximum load, simultaneously charging the battery and maintaining the operation of the computer. As a result, the power supply gets very hot.

But if the adapter remains hot after charging, then this is a reason to pay attention to its condition. Why is this happening? In addition to low power, there may be several other reasons why the power supply gets very hot:

You should also worry about the condition of the laptop and adapter if, when charging, the power supply gets so hot that you can’t hold it without discomfort. Human skin can withstand temperatures of 60-70 degrees, but if the adapter heats up to 80 degrees, you won’t be able to pick it up.

How to reduce the temperature of the adapter?

Now you know why the laptop power supply gets very hot. It remains to understand how to rid the laptop of this shortcoming. You can try the following methods:

• Place the power supply in an area where it can cool naturally. As noted above, the adapter should not be covered with a blanket or any cloth. It is also contraindicated for him to lie on the carpet and be exposed to direct sunlight.
• Try not to overload the laptop when charging. Wait until the battery charges before launching heavy games or resource-intensive programs.

If neither natural cooling nor temporary refusal of games reduces the temperature of the power supply, then you will have to buy new equipment with more power. But to prevent the laptop from burning out, you need to choose the right power supply, taking into account the voltage. Examine the markings on the laptop case. The charger parameters should be indicated there: for example, 19V-2.4A.

Then look at the current and voltage sieve on the old power supply, which gets very hot. The voltage on it should be the same, but the current strength may be a little higher.

To get rid of overheating, you should buy an adapter with the same voltage (19V) and higher current - for example, 4.7A instead of 2.7A. In this case, the power supply will maintain a low temperature when charging, because the load on the nodes will decrease.

Laptop temperature monitoring

You need to monitor not only the condition of the adapter, but also the temperature of all laptop components. It is difficult to determine how they heat up by touch, so special utilities are used for monitoring: Speccy, CPU-Z, etc. In addition to the power supply, it is necessary to periodically check the temperature:

• Storage devices, especially if the laptop has an HDD rather than a solid-state drive (SSD).
• Graphics adapter. The video card gets especially hot during games and when running resource-intensive applications: various graphics editors, multimedia programs.
• System board. The temperature of the motherboard largely determines how other components will heat up.
• Central processor. If the CPU overheats, system performance will drop dramatically.

You can see the maximum permissible temperature of the equipment in its specification, but if you use the Speccy utility, if it overheats, the indicator next to the device will turn red.

Another clear sign of excessive temperature rise is freezing and periodic unauthorized shutdown of the laptop. If you encounter such a problem, it is recommended to disassemble the laptop, clean the cooling system and case from dust and replace the thermal paste. In some cases, to maintain normal temperatures, it is necessary to install additional coolers built into the cooling pad. Without proper cooling, components can quickly fail, and their replacement will require significant financial costs.

In this sense, the heating of the power supply is not such a serious problem, because in most cases, users experience unnecessary worry about the temperature, when in fact the adapter is completely fine.

Yes, almost all chargers get hot. There's nothing wrong with that. But to be on the safe side, it’s better not to leave the charger on while you’re away. Here, some people advise turning off the phone while charging, then the charger will not get too hot. Yes, this method really helps. I checked it personally.

If the charger gets slightly warm during operation, there is nothing to worry about. This is fine. Put your hand on the ventilation grille of your TV, or touch the bottom of your laptop; they all generate heat while functioning.

Another thing is if the charger heats up and becomes almost hot. In this case, it is advisable to disassemble it and check whether everything is in order, nothing is leaking, and there are no foreign odors.

In addition, when charging your phone, you should never place it under a pillow or cover it with anything. The heat generated by the device must escape freely.

This can happen due to a faulty charger (contacts burn out) or the socket in which the charger is plugged in is not entirely suitable for it: the device dangles and, as a result, heats up.

I'm talking about situations when the charger gets hot significantly.

Chargers for modern smart assistants: laptop, tablet, smartphone, regular mobile phone, GPS navigator... are electrical circuits through which current flows.

Without going into the nuances of converting alternating current (mains) into direct current (for charging) and without dwelling on the elemental base, it should be noted that the electric current itself passing in the conductor leads to an increase in internal energy and its heating.

The law connecting the amount of heat generated with current and resistance was discovered by scientists J. Joule and E. Lenz.

It is written like this:



Q is the amount of heat,

I is the magnitude of the electric current,

R - circuit resistance,

t — time.

8th grade physics does not describe all the reasons why the charger heats up. Of course, it is necessary to take into account electromagnetic processes in the transformer (its efficiency) and other points. But the Joule-Lenz law works.

You can learn more about heating conductors from this video tutorial

There is no need to worry, but you need to remember some physical properties of electric current. It is known that every conductor of electric current has resistance. Roughly speaking, electrons must be pushed between the atoms of the conductor, collide with them, and heat is released, which heats the conductors. Therefore, the power supply temperature of 50 - 60 degrees is quite normal. It should be noted that all parts are in a plastic case, which transfers heat very poorly to the environment.

It's okay. Now everything is small and everything gets hot, this is in the order of things, but of course you need to know when to stop. When I bought myself a phone and put it on charge for the first time (while clicking it), I couldn’t hold my finger on the charger for a long time.

I'll tell you from my own experience. I have an extension cord for 3 sockets, not a surge protector, I bought it on ozon ru, and two devices are connected to it - a table lamp and a computer, and when I connect the charger to the third free socket, it heats up quickly, but when I just connect it directly to the wall outlet - then charging is normal. Hence the conclusion - the quality of the socket is also affected by the load on the socket.

Almost all phones still have this particular drawback. While the phone is charging, there is a load on the charger. According to the diagram, there is a transformer and a diode bridge, which create a closed circuit when the phone is connected, and this circuit heats up, that is, the transformer mainly heats up, but this does not change the matter. And how many times have I noticed that (sometimes you forget to turn off the charger from the network) nothing like this happens if the phone is turned off. The charger is practically cold.

Many mobile phone users are concerned that their charger gets hot and hot quickly when charging their phone/iPhone or tablet.

Of course, the question arises: should the charger of an Android smartphone, iPhone or tablet heat up?

Typically, it takes power from a wall outlet (usually 220 volts) and converts it to a voltage that can be safely used by a cell phone (about 5 volts).

Only the conversion process is not 100% efficient, and always part of the power remains turns into heat.

This is what causes the charger to heat up. This can be seen primarily when using the fast charging function.

It is better for the phone to avoid the fast charging feature as generating higher voltage also causes the battery to heat up. I recently wrote about how to properly charge your phone so that the battery lasts as long as possible.

The fact that cell phone chargers get hot is a natural result of voltage conversion. Therefore, he should not bother us. The fact that the device heats up when charging is absolutely normal applies to all chargers.

The fact that the indicator does not flicker may cause concern - if after a few hours of charging the battery is not charged (stays in the same place as it was), it is worth trying to charge using another one.

When can the charger get hot?

Sometimes excessive heating can indicate a serious electrical problem inside the phone or charger - for example, the diode bridge is heating up - especially if it is from China.

If it gets so hot that you can't touch it, or the plastic casing starts to melt, unplug your phone from the power source as soon as possible.

Does the charger charge your phone quickly?

How do you rate the performance of the charger for your smartphone/iPhone or tablet?

If you suspect it's not charging your smartphone as expected, or you're just curious, there are ways to test it.

This applies to owners of Android phones. The first step is to find out what the reason is by downloading the Ampere application from Google Play.

After installation, launch it and you can start testing right away. To do this, connect the charger to the device and to a power outlet or computer via USB (you can connect it to a powerbank).

In any case, it must be connected to the place where the power is consumed. After about 10 seconds, you will see the measurement results on the left side of the smartphone screen.

You'll also see two different text colors in the app - orange when the device is plugged in to charge and blue when it's not. In the latter case, you will see how much power is currently being consumed.

The app is very intuitive to use and you'll be able to get the hang of it quickly, I'll just give you a hint that moving the icon to the left will show you all the battery stats (negative numbers mean the battery is getting low).

Remember that if your phone is working very hard at the moment (you have a lot of apps open), you may see worse battery stats, but it won't be a battery fault.

Therefore, it is best to disable all applications in addition to Ampere when testing.

On each USB adapter label, you will find "output" and technical information next to it.

Pay attention to the mA level and subtract from this number the amount you see on your phone display in the Ampere app.

For example, if you have 1000 mA on the charger, then you should expect that charging power minus what is currently loaded by our smartphone (depending on screen brightness), e.g. 1000 mA - 240 mA = 760 mA.

So as not to bore you, I'll be back in a week with tips on what to do if the USB adapter isn't charging your phone correctly. Good luck.