If the charging circuit of your device is working properly (it charges normally from another charger), but it does not charge from the charge you need (for example, through a cigarette lighter), you can do the following:
Replace/repair/remake the cable from the charger to the device being charged (there is no point in saving on the quality of the wire; often a shorter and thicker cable charges faster)
Replace/repair/modify the charger (a charger with a more powerful current may charge faster, instead of a charger you can use an external battery; some have more powerful outputs - about 2 Amperes, this can help if the device is completely discharged)
More details
Often the problem is just a USB cable with high resistance (for example, the wires are thin and long). Sometimes the cable may be partially broken (one core remains intact or the broken wires are attracted to each other only by insulation) in this place the resistance increases sharply.
When you try to charge with a high current, the voltage drops significantly at a high resistance and becomes insufficient for the device being charged. Such wires may be suitable for data transfer and charging low-current devices, but not for charging devices that require high current. If it is not possible to replace the wire, you can significantly shorten it or cut off the connectors from it and solder them to a wire of a larger cross-section; it probably will no longer work as an information cable.
If the device being charged is turned off (put into sleep mode), charging will go faster, or will be possible at all.
Most often, a power supply with USB connector at the output, which has 4 contacts: two are 5 Volts direct current and two informational ones Data + and Data - . The device being charged, for correct charging (the task is not to overload the charger, to ensure the fastest possible charge, not to use an unidentified or weak charge), tries to calculate the characteristics of the charger through the state of the Data + and Data - signals.
Accordingly, some manufacturers can install jumpers, resistors, and more complex solutions between the contacts of the USB charger connector, with the help of which the device will recognize the charger as original and charge. Without “seeing” the required states of information signals, the device will not begin to charge.
The Micro-USB connector has 5 contacts, an additional contact is most often used to recognize the fact of connecting a cable (for example, a USB OTG cable - it has a jumper between 4 (ID) and 5 contacts) and switching to master device (host) mode, in some models may affect the current consumed when charging the device.
If the rated power, voltage of the charger and other quality characteristics are suitable for charging your device, then the charger can be modified by finding the appropriate circuit.
You cannot cheat the charging circuit (or use a low-current charger in the case when the high-current device being charged does not have a charger power recognition circuit), you cannot use a low-quality cable, since there will probably be no charge anyway or it will take a long time, either the charger or the charging circuit may fail device being charged.
The maximum current drawn through the USB bus power lines must not exceed:
USB 2.0 - 500 mA;
USB 3.0 - 900 mA;
USB 3.1 up to 5A.
USB 2.0 is still the most common - by default, the device is guaranteed to consume a current of up to 100 mA, and after coordination with the host controller - up to 500 mA.
Power supplies with USB output as a rule, they can deliver significantly more current than a USB port.
Often, to increase the current received from the computer's USB ports, a Y-type cable can be used, which allows you to receive power from two ports at once.
Ai Charger and APP Charger programs, which help charge devices faster by receiving a current of more than 500 mA from the USB port (probably will not work on every motherboard).
Quick Charge 2.0 - Qualcomm technology using more powerful Charger and the use of higher voltage (Quick Charge 1.0 simply meant a more powerful charger - 5 Volts/2 Amperes)
Output voltage/current: 5V/2A, 9V/2A, 12V/1.67A and 20V
Power - about 18W
Quick Charge 3.0 is a Qualcomm technology; compared to 2.0, the charging algorithms are mainly optimized; the speed has not increased significantly compared to 2.0. Quick Charge 3.0 asks the device for the required voltage, which can be anything in the range from 3.2V to 20V in 200 millivolt increments. This provides a greater selection of available voltages.
Standards:
Battery Charging v1.2 Spec and Adopters Agreement (BC1.2)
IEC 62680-2:2013 Part 2: Universal serial bus - Micro-USB cables and connectors specification, revision 1.01
IEC 62680-3:2013 Part 3: USB Battery Charging Specification, revision 1.2
The battery is the weak point of any laptop. The older he gets, the faster the battery drains. Therefore, the issue of recharging it becomes more and more acute, and the charger is not always at hand. Is it possible to charge a laptop via a USB port from another computer or from an external PowerBank? Let's try to understand this issue.
If I had been asked this question a few years ago, I would have confidently answered that no, you can’t! Indeed, previously the USB port on a laptop was used exclusively for connecting peripheral devices. Yes, it was possible to recharge a phone or tablet from it, but it did not have the opposite effect. A special power supply was used to charge the battery. Moreover, often each manufacturer had it with its own individual connector, which was terribly inconvenient. Especially on the road.
But time passes and everything changes. On the latest models of laptops, netbooks and ultrabooks, a new USB port 3.1. This is the so-called connector Type C. This is what it looks like:
So thanks to technological progress it is finally possible to use USB ports for charging a laptop.
What are the differences between ports
The point is that I USB standard was developed quite a long time ago, back in 1994. And then the question of supplying pure power through this bus did not arise at all. Subsequently, over more than 20 years, quite a few types of USB connectors were invented:
But the only thing they all had in common was that they could not provide power transmission of more than 4.5 Watts. If this was at least enough for a smartphone or tablet, then for a laptop you need at least 30, and preferably 50 or more. Accordingly, charging a laptop via USB was out of the question until a more energy-intensive version appeared. And Type C became it. It is almost half the size of the usual 2.0/3.0 standard port:
But it can easily provide current transmission of up to 100 Watts in both directions - that is, both to the connected devices and from them to the host. This is quite enough not only for ordinary models, but even for gaming laptops. You can take one or two powerful power banks with you on the road and not worry about not having an outlet at hand!
What about owners of old models?
Unfortunately, they will not be able to charge a laptop via a USB port under any circumstances. They just don't know how to do it. How to be in this case? Just buy an extra battery and carry it with you. Or, alternatively, save money to buy a new one mobile computer. You may object - you can’t save enough money for this! But if your work depends on it, then maybe it makes sense to invest? You decide! Good luck!
Let's imagine this unusual situation. The user purchases a tablet, unpacks it and decides to charge it from the computer. Using a USB cable, he connects the device to a computer or laptop and... Nothing happens. At all. What's the matter, what to do in such a situation?
Lack of power
Some tablets simply do not have enough power to charge from a USB port. As a rule, this applies to models with large screens, since they consume a lot of energy, but, according to reviews, this drawback also occurs on small tablets.
What to do? Accept it as a feature of the device, but you still can’t do anything about it. Charge your tablet from the mains.
By the way, if there is a lack of power, the tablet may show that it is charging from the USB port, but in reality it will not charge.
Reboot your tablet
If until now the tablet was charging from USB, but now it doesn’t want to, it may be a failure operating system. Which OS, computer or tablet? Just in case, we recommend that you first restart the tablet and, if this does not help, the computer.
By the way, try connecting the switched off tablet to the computer and see the effect, this often helps.
Use a different USB port
It is possible that the port you are using has some problems, as a result of which it does not charge the tablet. Try using a different USB port; fortunately, even laptops have at least 2-3 of them.
Check the USB cable
This is especially true if you have pinched a cable or have pets that love to chew on wires. To check the wire itself, try using it to charge the device from the mains. Not charging? Most likely, the problem is in the wire, although we must not forget about USB connector on the tablet itself, which could fail.
The most common problem with most laptop users is the battery not charging when the power supply is turned on.
It happens that this problem happens with a new (just purchased) laptop.
There are some variations of this.
For example, the system reports a connected battery, but does not charge.
Also, the laptop itself may not respond to being connected to a power outlet.
Let's look at the most common reasons why charging is not happening.
Low voltage
One of the most common reasons is that you see that in the Windows notification area there is a system message that the battery is charging, and in parentheses - "Plugged in, not charging".
Alert Area Message
Check the power supply voltage.
Maybe the problem is in the entire apartment or a specific outlet.
Plug it into another one and see.
Cord problem
The wire may break under the braid.
In this case, you need to check the voltage with a tester.
If it is not there, then connect it to another device or use a working power supply (and you know that it definitely works).
Often, many people do not have such capabilities and need to buy a new adapter.
Battery overheating
With this option, the system stops charging so as not to damage the laptop battery itself.
If you just plugged it into the outlet and it charges normally, but after a few minutes it suddenly stops, then the reason is that the battery itself is overheating.
No charge when the power supply is working
Have you returned from the store with a brand new laptop and discovered that it won’t charge, even though a licensed system was pre-installed on it?
In this case, there may be a manufacturing defect, which is unlikely, or incorrect initialization of the battery (problem with the controller).
We perform the following actions:
- Turn off the laptop itself
- Disconnect the cord from the laptop
- Pull out the removable battery
- Press the start button, holding it for 15-20 seconds
- We return the battery to its place
- Connecting the battery
- Turn on the laptop
These steps don't always help, but at least they are safe, easy to do, and will save you time if the problem is resolved.
There are two more varieties of this method:
1. Only for the case with a removable battery - turn off charging, remove the battery, then press the power key and hold for a minute.
Then we connect in the following sequence: battery - charger.
The laptop must be left turned off for at least 15 minutes, then turned on.
2. With the laptop turned on, turn off the charging without removing the battery.
Press the start button and hold it until it turns off completely (in most computers until it clicks) for another minute.
After this is done, connect the charger and after 15 minutes, turn on the laptop.
BIOS problem
If none of the above worked, then the problem with the laptop's power management and charging may be due to an early version of the BIOS.
In this case, resetting the BIOS settings will help the computer owner. To do this, we perform the following actions:
- Turn off the device
- We take out the battery
- Disconnect the charger from the network
- Press the start key and hold it for a minute
- Connect the laptop to a power outlet without a battery
- Turn it on and go into BIOS
Logging into BIOS for various laptop models
- Acer- keys such as F1, F2 or Del.
- Asus- F2 or Del keys.
- Lenovo- the same keys as in previous cases or F12
- HP- you can press the same buttons or Esc.
Other netbook/laptop models use the same keys as described above during boot.
1. Find an item Load Defaults(it's in the EXIT menu).
This way you will set the default settings that are optimal for your laptop.
3. Turn off the charging, insert the battery and you can start the computer.
After completing these steps, the system reports correct charging and battery detection.
Use the next step if none of the above helped.
Find downloads on the official website of the manufacturer of your brand of computer, in the section "Support" download and install the updated BIOS version.
Don't go wrong with your device model!
ACPI and chipset drivers
You can eliminate them in the following ways.
The first of them can help, if yesterday your charging was working, but today it stopped, then we follow this algorithm:
Go to the device manager (using the menu by clicking right click mouse on "Start")
In chapter "Batteries" we find "Microsoft API Compliant Battery Management" or something similar in name, see if it is in the device manager.
If it is not there, then this may indicate either a malfunction or a lack of contact.
Right-click on it and select "Delete".
Confirm deletion by clicking OK
After this, be sure to restart the laptop through
Crash after Windows update
If charging problem occurs after reinstallation or update Windows systems, then most likely you do not have the original chipset drivers and power management from the manufacturer.
Moreover, in the device manager itself the presence of installed drivers no updates for them.
In this option, go to the official website of the manufacturer of your device, download and install drivers for your laptop model.
To guide you? I will give their names below:
- Intel Management Engine Interface
- ATKACPI (for Asus)
- Individual ACPI drivers
There are also others system drivers. And software(Power Manage or for Lenovo and HP laptops – Energy Management).
power unit
If the battery is connected and seems to be charging, but in fact it is not, then you need to try all the methods described above to resolve the problem.
Did not help?
Then most likely the cause of this problem lies in power supply malfunction.
Check to see if the unit's light (if any) is on.
When a device does not turn on without an adapter, the most likely cause is the adapter (but it could be the connectors or electronic components of the device).
There are cases of malfunction of both the charger itself and the controller on it.
There are also problems with the laptop connector or battery connector - oxidized or damaged contacts.
The same points cause problems with the adapter even when there are no charging notifications at all in the notification area of the Windows system.
In this option, the computer runs on battery power and simply “does not see” the connected power supply.
Extra programs
If you have completed all the previous steps, but understand that your device is quickly eating up its charge, then you need to pay attention to the running programs in background.
To do this, open the task manager by holding the Ctrl+Shift+Esc key combination and analyze the processor usage.
We need to sort those applications from the list that use the processor the most and watch them for a few minutes.
By removing programs running in the background, we will extend your battery life.
Checking battery wear
There are cases when old battery does not charge or is not fully charged.
This occurs when charging/discharging cycles are used very frequently. This reduces the capacity of the battery itself; people say “it runs out quickly.”
And it turns out that it discharges very quickly and is not fully charged.
The question arises, how to find out the actual capacity of the battery and the degree of its wear?
You can take your laptop to service center, or you can try to solve this problem yourself.
First way
Check these parameters via the command line.
Go to the start menu and command line enter
and press Enter.
Or on the command line enter
Powercfg energy
plus the Enter key.
If the system requests administrator access, then you need to log in with account administrator
After this, a notification about the operation of the system should appear, and a report will be generated in 30 seconds.
In our version, the system placed it at the address “ C:\Windows\System32\energy-report.htm«.
After that, go to the folder with the report, then copy it to the desktop and open it.
After that, in the file that opens, look for the line that contains information about the battery.
We are interested in the last two lines, which are highlighted with a yellow arrow.
New laptop with battery
This is a more significant problem, but before you run to the store where you bought it, I advise you to reset the BIOS settings (how to do this is described above)
Be sure to compare the markings on the new and old batteries.
Please pay special attention to the fact that you must buy a new adapter either with the laptop or take the old one with you.
Should I repair the battery or buy a new one?
If you know specialist people who can do this, then contact them.
But you need to understand that this process is very labor-intensive and requires considerable skill and practice.
Unfortunately, many companies assure you that they will help you, but in fact they only want your money, and after the intervention of “such specialists” you will have to buy a new battery.
By the way, the cost of such services is often the same as a new battery.
Today, the electronics market is overflowing with offers.
And without much difficulty you will get a high-quality Chinese-made battery, which is not inferior in quality to the original, but at the same time costs an order of magnitude cheaper.
In any case, do not be discouraged, follow the points given in this article.
If you are unable to resolve this problem on your own, then contact a good service center.
Remember that the device’s battery must be treated with care, as it is a consumable item that can very easily fail.