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Can I Charge Laptop By Charging From Phone

What are the difficulties of charging a laptop battery without a laptop?

How do you get around a laptop when charging its battery? As you probably know, there are many contacts on the laptop battery connector. In most cases, this is 6, 7 or 9 pins. All of them are designed to monitor the laptop and the operating system with how charging is in progress. At first glance, it is not even clear how to put such a battery on charge. This is not a car battery, where there are only two conclusions and it is impossible to make a mistake.

In various forums about electronics, you can find circuits designed to charge some batteries from different manufacturers. But finding something for your battery is almost impossible.

Lithium batteries can easily ignite and even explode as a result of overcharging. If they are subjected to a deep discharge, they may become unusable. Therefore, the laptop battery has Multilevel protection and voltage monitoring of each lithium cell. The controller controls the discharge and charge of lithium batteries. This is the board that is inside the battery case.

All lithium cells that make up the battery have a scatter in the parameter values. In the case of a serial connection, their charging will be uneven. As a result, they will be charged to different voltages. This is not valid for lithium cells. Therefore, a lot of contacts are provided, among which there are conclusions that allow you to control and charge each element individually. Therefore, charging the battery without a laptop is not so simple. You may also be interested in an article on how to turn on your phone without battery.

In the process of discharging the BMS, the driver controls the degree of discharge of lithium batteries and disconnects the battery at a certain voltage. This is to ensure that the battery does NOT experience deep discharge.

In general, the question of how to charge the battery without a laptop interested me and I began to dig in this direction. Unfortunately, there is very little information on this topic on the Internet. I watched all the videos on Youtube on this topic. Found a similar problem where the author explains how to charge the battery from an Asus laptop without the laptop itself. Additionally, you can read why the Asus laptop battery indicator blinks.

Described in this video, the Asus battery has a 9-pin connector. The author of the video found out that two extreme contacts on both sides are 2 pluses and 2 minuses. Three contacts in the middle are designed to read information on 3 pairs of cells that make up the battery. The remaining two contacts were responsible for turning on and off the laptop battery. So they needed to be closed directly to charge the battery without a laptop.

Now to my story. I needed to charge the battery from a laptop Lenovo IdeaPad Z565 in the above way. What came of this, read below.
To return

What is required to charge the battery without a laptop?

In order to charge the battery without a laptop, you will need the following materials and tools:

Power adapter. This can be a regular laptop power adapter or any other that has a voltage that exceeds the rating of your laptop battery. The power should be 60-90 watts. In my case, the nominal value is 11.1 volts. Since I had a standard adapter available, I used it;

  • Copper wire with a cross section of 1-2 mm;
  • Resistance. It is better if it is a trimming resistor, which can be used to regulate the current supplied to the battery;
  • Soldering iron, flux, tin;
  • Multimeter for monitoring battery voltage.

How can you charge a laptop battery without it

Those who often travel on vacation or on business trips know how sometimes spare laptop batteries can be useful. When using a laptop without connecting to an outlet, the battery energy quickly runs out and here another battery will help out a lot. But here’s how to charge all those extra batteries? It’s a bad idea to take turns putting them in and out of your laptop. The case of the battery and the compartment for it on the laptop are made of plastic, which means that with constant replacement of batteries, all this will quickly wear out. Today we will talk about how to charge a laptop battery without a laptop. We must say right away that you do all the described manipulations at your own peril and risk, since safe battery charging can only be carried out in a laptop or using factory chargers.

How to charge a laptop battery directly?

The process of charging the laptop battery directly

Basically, only general information, disassembling batteries, etc. Nothing to help with the case. The connector looks like this.

Battery Connector Lenovo IdeaPad Z565

Two with pins on the edges are plus and minus, and three in the middle are responsible for assembling elements. Two contacts for unlocking, as on Asus, but not. And I logically assumed that such protection on Lenovo batteries is simply lacking. And he was right.

charge, laptop, charging, phone

To begin with, I discharged the battery right in the laptop until He Disconnected. Disconnected the battery and measured the voltage at the positive and negative terminals with a multimeter. It was 10.5 volts. By the way, be sure to set the polarity. On my battery the designations “”-” did not have. This can be done with the same multimeter when measuring voltage. If the value is given with a plus, then the polarity of the probe connection is correct. If minus. reverse polarity.

Battery voltage measurement

Multimeter probes with needles

The power adapter, as already mentioned, I used the standard laptop Lenovo IdeaPad Z565. Its output voltage is 20 volts, and the power is 90 watts. That is, it is capable of charging with a current of 4.5 amperes. But I did not dare to turn it on in full. Indeed, in a laptop, the battery is charged under hardware and software control and 7 pins on the connector are not at all for beauty.

Trimmer resistor with soldered wires

Connecting wires to the laptop battery terminals

I also brought plus and minus from the power adapter. The positive wire was connected inward, and the negative wire to the outer sheath.

Then I turned on the adapter with the mains and started charging with a current of 1.5 amperes. At the same time, just in case, I controlled the temperature of the battery, but its temperature did not rise above room temperature. Only the resistor was warming up, but this is its job. Periodically monitored the voltage at the terminals. After turning on the adapter, it jumped to 11.25 volts and began to grow slowly. After about forty minutes, I reduced the resistance of the trimmer to 45, and then to 30 ohms. As a result, the current was increased, first to 2, and then to 3 amperes.
The nominal battery capacity of my laptop is 4.3mAh. In such conditions, the battery was charged for a little over two hours. The voltage during this time increased to about 12.4 volts and stopped there.

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Later, on some forums on electronics, I found information that this behavior indicates the activation of the BMS controller protection.

The table below lists the threshold voltages when charging batteries with different ratings.

Battery nominal voltage, V Maximum charging voltage, V Battery nominal voltage, V Maximum charging voltage, V
7.4 8.2-8.4
10.8 12.3-12.6
14.8 16.4-16.8

You probably have a question: “Why a resistor?” Yes, you can connect the wires directly from the adapter and it will fully charge. In my case, this is explained by considerations to keep the battery safe and sound. And to everyone who will try this method, I advise you to connect the battery through a resistor. After all, if, for some reason, the current rises, the resistor will burn out, and the battery will be safe.

What’s the bottom line? We found out that it is possible to charge the battery without a laptop and it is not very difficult. In addition, we learned that the battery on the Lenovo IdeaPad Z565 lacks battery on and off. He has 7 pins on the connector against 9 in the batteries with protection. I’m not sure if this is the same state of affairs on all 7-pin batteries. Therefore, before charging your laptop battery this way, find out the pinout.

Arguments for charging from a computer:

  • The ability to stay connected. Sometimes you need a few percent of the charge to make an important call or send a message. It is enough to connect the smartphone to the nearest computer and replenish the battery of the device.
  • Convenience. If there is a computer nearby with several free USB ports, you do not need to look for a free outlet or install an electrical splitter.

Is it possible to charge a laptop with a phone charger

The answer will be immediately: “available.” There are a number of reasons for this. Laptop power supplies from which laptop batteries are charged have different voltages. Their range of voltages is 12 Volts, 15 Volts, 19 Volts, 24 Volts and 27 Volts. Charging currents start from 3 Amperes and above.

Arguments against charging from a computer:

  • Virus Infection Threat. If you connect your smartphone to someone else’s computer, you can accidentally get a dangerous file. a virus. To insure against the problem, before connecting, open the phone settings section and select the “Charge only” mode. This function blocks the transmission of information.
  • Slow charging. The USB ports on your computer are NOT capable of providing the required current to charge your mobile phone, so the battery charges slowly. Sometimes you need to wait a few hours for the smartphone to reach at least 50 percent of the charge.
  • Battery worn out. Some users have noticed that with frequent recharging from a computer, the smartphone battery starts to drain faster. That is why phone manufacturers recommend using original chargers to fill the battery with energy.

Difference between charging from USB 2.0 and 3.0 connectors

Most modern computers have modern USB 3.0 ports. This connector allows you to charge your phones faster thanks to the increased current of 900mA. The outdated analogue (USB 2.0) had an indicator of 500 mA, which is why smartphones were charged from computers very slowly. If it is important to quickly get a few percent of the charge, connect your phone to a modern USB port (3.0). Typically, such a USB port is blue inside.

If using a voltage converter

Even if the laptop is connected to a phone charger for charging, through a voltage converter (from 5 volts to 15 volts and above), the charging current will be constant. The charging current will NOT change in any way. Your phone charger will be overloaded again.

There is also the Joule-Lenz law, which is known from the school physics course. The Joule-Lenz law shows the direct proportionality (dependence) of the amount of heat (Q) emitted by the conductor of electric current, when current (Y) passes through it, from the square of the current strength, from the resistance (R) of the conductor itself, and from the time of passage of the current (Y ) on it.

The formula looks like this:

  • Q = Y2Rt, Where
  • Q. the amount of heat, expressed in joules (J)
  • Y. current, expressed in amperes (A)
  • R is the resistance of the conductor itself, expressed in Ohms (Ohms)
  • T. time of passage of current through a conductor, expressed in seconds (s or s)

The operation of electric heating devices is based on this law. Only electric heaters have a different design, so they reach a certain heating level, and keep a certain temperature, which is working for them.

Not so with the charger. It consists of different parts, elements, which have different characteristics, different properties, and are designed for certain loads. With the passage of large currents, which are several times higher than the rated current, the entire charger heats up, which leads to strong heating following the Joule-Lenz law. And this will cause the charger to malfunction.

Based on the above reasons, you cannot charge your laptop, even slightly, using your phone charger.

Modern phones have improved a lot, but users have to pay the price for new features with short battery life. If you constantly use your smartphone for entertainment, surfing the Internet or making phone calls, the battery usually discharges in half a day (5-7 hours).

A message appears on the screen asking you to connect the device to the electrical network, and here a problem arises. often there are free sockets nearby. You can always recharge your phone from a computer or laptop. just use the USB port. We will look at the advantages and disadvantages of this method.

What if, the USB port stops working after charging

Sometimes the phone puts a heavy load on the USB port, and it stops working, as if it freezes. In such cases, the message “The USB device is not working properly and has exceeded the power limits for its hub port” might also appear. Then it is better to disconnect the phone from the computer and it is from it that it is better not to charge. In the window with a message about the problem, click the “Reset” button, if any.

Even after stopping charging, the USB port may still NOT work. In this case, you can:

  • Go to Device Manager
  • Find a broken USB Root Hub, which will be marked with an exclamation mark
  • Go to Properties. Food “:
  • Press the “Reset” button.

But if that doesn’t help, then unplug your computer completely from the power outlet. If this is a laptop, then it is better to also remove the battery for 10 seconds and put it back. Now plug in and check.

Why it will not work to charge the laptop with telephone charging

The charging power will also be different. The charging current of the laptop battery and the charging voltage depends on the power of the battery itself, on the number of cells. The more powerful the battery, the higher the charging current and the higher the charging voltage.

Chargers for smartphones, cell phones, tablet computers have a charging voltage of 5 volts. And the charging current rarely reaches 1 ampere.

From here you can calculate the power of the chargers. Power is calculated using the formula P = UY, Where:

  • P. power is expressed in watts (W)
  • Y. current, expressed in amperes (A)
  • U. voltage, expressed in Volts (V)
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It turns out that laptop power supplies have a number of capacities

The charger (charger) of a mobile phone, in the case of a charging current of 1 Ampere, has 5 W, according to calculations by the formula.

The power of the laptop power supply is 8.4 times the power of the phone charger. This is the case if the power of the laptop power supply is 42 watts.

In this case, the current is always 3.5 times higher. This means that when you try to charge the laptop with a charger from the phone, the charger will run wild, due to exceeding the nominal values ​​by several times.

Why it will not work to charge the laptop with telephone charging

The charging power will also be different. The charging current of the laptop battery and the charging voltage depends on the power of the battery itself, on the number of cells. The more powerful the battery, the higher the charging current and the higher the charging voltage.

Chargers for smartphones, cell phones, tablet computers have a charging voltage of 5 volts. And the charging current rarely reaches 1 ampere.

From here you can calculate the power of the chargers. Power is calculated using the formula P = UY, Where:

  • P. power is expressed in watts (W)
  • Y. current, expressed in amperes (A)
  • U. voltage, expressed in Volts (V)

It turns out that laptop power supplies have a number of capacities

The charger (charger) of a mobile phone, in the case of a charging current of 1 Ampere, has 5 W, according to calculations by the formula.

The power of the laptop power supply is 8.4 times the power of the phone charger. This is the case if the power of the laptop power supply is 42 watts.

In this case, the current is always 3.5 times higher. This means that when you try to charge the laptop with a charger from the phone, the charger will run wild, due to exceeding the nominal values ​​by several times.

If using a voltage converter

Even if the laptop is connected to a phone charger for charging, through a voltage converter (from 5 volts to 15 volts and above), the charging current will be constant. The charging current will NOT change in any way. Your phone charger will be overloaded again.

There is also the Joule-Lenz law, which is known from the school physics course. The Joule-Lenz law shows the direct proportionality (dependence) of the amount of heat (Q) emitted by the conductor of electric current, when current (Y) passes through it, from the square of the current strength, from the resistance (R) of the conductor itself, and from the time of passage of the current (Y ) on it.

The formula looks like this:

  • Q = Y2Rt, Where
  • Q. the amount of heat, expressed in joules (J)
  • Y. current, expressed in amperes (A)
  • R is the resistance of the conductor itself, expressed in Ohms (Ohms)
  • T. time of passage of current through a conductor, expressed in seconds (s or s)

The operation of electric heating devices is based on this law. Only electric heaters have a different design, so they reach a certain heating level, and keep a certain temperature, which is working for them.

Not so with the charger. It consists of different parts, elements, which have different characteristics, different properties, and are designed for certain loads. With the passage of large currents, which are several times higher than the rated current, the entire charger heats up, which leads to strong heating following the Joule-Lenz law. And this will cause the charger to malfunction.

Based on the above reasons, you cannot charge your laptop, even slightly, using your phone charger.

The answer will be immediately: “available.” There are a number of reasons for this. Laptop power supplies from which laptop batteries are charged have different voltages. Their range of voltages is 12 Volts, 15 Volts, 19 Volts, 24 Volts and 27 Volts. Charging currents start from 3 Amperes and above.

Efficient laptop charging with Power Bank

Considering the efficiency of charging a laptop from a portable battery, we can say with confidence that this method is very good. It makes it easy to use a laptop without access to the electricity network.

Just imagine how pleasant it is to use a laptop at work or when moving to another city without a power supply. Your laptop battery plus the capacity of your portable battery is very convenient. This approach will provide you in the process of using a laptop PC about 5-8 hours of operating the device without being connected to a power source.

Connecting Power Bank to laptop via USB

Many voz-bank users think that this device can be connected to a laptop via a USB cable. This is indeed possible, provided that you have the latest USB 3.1 port on your laptop. This type of connection also has another name.Type C.

If your laptop has the above connection type on board, but only USB 2.0 and 3.0, then you will under no circumstances charge the laptop for “USB cable ”cannot. The reason for this is quite simple: ports 2.0 / 3.0 have a voltage transmission of only 4.5 volts, for a tablet and a smartphone this power may be suitable, and to charge a laptop at least 30, and best of all. 50 volts and higher.

How to connect voz-bank to laptop correctly

To find out how to connect the Power Bank to a laptop, you should take into account the above requirements for a portable battery accessory device and your personal computer, as well as find out what ports for connecting various devices are available on your laptop PC.

Based on the above, the question arises: how to connect the Power Bank to a laptop PC, if you are NOT the owner of a laptop with the Type C 3.1 port available on it? The answer to this question is this: subject to the necessary characteristics of your charger, you need an adapter from the car-bank to the connector for charging the laptop.

It is unlikely that the adapter you need will be included with the charger. it should be purchased separately. If you have a suitable adapter for a Power Bank laptop, then from port 2A through a cable it must be connected to the power connector on the laptop.

Is it possible to charge a laptop from Power Bank

A laptop is a convenient portable device that we can take with us both to work and when traveling. But the problem lies directly in the battery charge, the volume of which is enough for 3-4 hours at best. When asked if a laptop can be charged from Power Bank, the unequivocal answer is yes! Technologies are improving every year, and now no one will be surprised at the creation of a portable charger (Power Bank), which can level the lack of a nearby power source, which solves many problems for the laptop user.

It should be noted that NOT every such device can become your faithful assistant when charging your laptop. To do this, the Power Bank must have the necessary characteristics or be specialized for a laptop charge. Let’s figure out how to charge a laptop via Power Bank.

Required Power Bank Specifications for Laptop Charging

Often, owners of a portable charger wonder how to charge a laptop using Power Bank. To do this, he must have the characteristics that will be described below.

To charge, the device must have an output voltage of 18 to 20 volts and a rated current of two amperes. Not all portable chargers have these parameters. As a rule, the exception is made by Chinese fakes of popular models and manufacturers of car banks.

In order to accurately select a device for charging your laptop, pay attention to the following things:

  • The presence on the case of ports for connecting a USB cable in 1A and 2A. The letter (A) following the number means amperage, which gives this port at the output. They can also be used simultaneously, and the figure, respectively, indicates the number of Amperes.
  • For comfortable operation of the charger and laptop, the charge-bank must have a storage battery capacity of at least 10,000 milliampere-hours (mAh).
  • The Power Bank must have a cable for charging a laptop with a certain size, so pay attention to the accessories of the adapters: they must be suitable for the device that you want to charge. Otherwise, it will not be possible to connect even a charger corresponding to all parameters to a laptop.
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At the end of the description of the required characteristics of a Power Bank for charging a laptop, it is worth noting that there are specialized chargers with all the above characteristics and the required adapters. When choosing a who-bank, pay attention to them.

Charge from a universal portable battery

To charge a laptop from Power Bank, you need to know how to properly “to interact” with a portable device. This is an important point to consider before charging your laptop. So, the cart must be charged up to 100 percent before use on a laptop. If the device was recently purchased, it should be fully charged and discharged for optimal battery performance in the future.

If the device has not been charged to 100 percent, then there is a special sense in trying to charge the laptop, because it will be discharged much earlier than the laptop battery is full. An exception to this rule would be car cans with a battery capacity of 20,000 mAh and above.

How to choose a Power Bank to charge your laptop

To understand the question of whether it is possible to charge a laptop from Power Bank, you should make the right choice when buying it. When buying a mobile charger, pay attention to original devices with high-quality rechargeable batteries from popular manufacturers.

As a rule, Chinese counterfeits have low quality batteries. At the same time, manufacturers of such devices promise the consumer a capacity of 20,000 mAh, but in reality, the promised volume available to the user is not observed. Accordingly, the output current on such a device will be low and will definitely not be enough to charge the laptop. By the way, connecting such a Power Bank to a PC will be very problematic.

The average laptop has a battery with a capacity of 10,000 milliampere-hours, so for the effective use of a portable charger, either its capacity is similar or slightly less. This will allow you to charge your laptop, if not 100 percent, then at least 70-80, which is a fairly good result.

Can I charge my laptop with Power Bank? Technique for charging a laptop using a voz-bank device

Power Bank is a universal portable charger with which you can recharge your smartphone or gadget from anywhere. Thanks to this invention, the problem of restoring the charge of a mobile device is easily solved. Can I charge my laptop with Power Bank? This question still arises for many people. The article will discuss in detail the solution to the problem in the possibility of charging a laptop using a portable Power Bank charger.

So, you got the answer to the question of whether it is possible to charge a laptop from Power Bank. In this article, we found out the required characteristics of a portable charger for recharging a laptop, and also fully figured out how to connect a universal charger to a laptop.

Dangerous chargers

The HP Chromebook 11 is the first laptop to use a Micro USB connector for charging. Most laptops require more power and cannot be charged this way.

But this laptop was also taken off the market due to reports of overheating of the charger, which could cause a fire. HP Representative Advises Customers Who Purchased HP Chromebook 11 Not To Use Original Chargers Shipped With The Device.

You can continue to use your laptop by charging it through one of the micro-USB chargers tested by Underwriters Laboratories Inc. (US Standardization and Certification Company), such as from a tablet or smartphone.

This means that the charger has been tested for safety, it will no longer become a prerequisite for a fire and will NOT shock you. But in some cases, even proven chargers can cause trouble, namely when the device’s battery is faulty. So the prerequisite for a fire can be a non-original cheap charger, and an equally cheap, not certified battery.

Can I use any charger for any gadget?

Every device: tablet, smartphone, e-book or laptop comes with its own charger. At least that was until recently. Nowadays most modern smartphones and tablets have a Micro USB connector and this is becoming the standard. Against this background, the question arises: can you already charge all your gadgets through one charger??

Despite the fact that over time more and more chargers are produced according to a single standard, several types of chargers are still widespread:

  • Laptops. Unfortunately, there is still no single standard for charging laptops and netbooks. There is a universal connector, which means that each device needs an individual charger.
  • 8-pin connectors (lightning connectors) for Apple gadgets. Since 2012, Apple has standardized the 8-pin connector, and now all devices released after this year: iPhone, iPad, iPod Touch, iPad Nano, can be connected using a charger certified and designed by Apple.

8-pin Lightning connector

Older Apple devices have a 30-pin connector, and for those who have them, Apple releases lightning → 30 pin adapters.

  • Micro USB chargers. All new smartphones, including those based on Android and Windows Phone, come with a standard micro USB connector, so there is no need to select individual chargers for them, as for old mobile phones. To meet this standard, Apple offers Lightning connectors → Micro USB adapters.

Can any Micro USB device be charged from any Micro USB charger?

In theory, each Micro USB charger can be plugged into a device with such a connector, which means that it can be used in general for any device, be it a smartphone, tablet or even a laptop. Very convenient. if you buy a new smartphone or tablet, you can charge it with an old charger. The only difference is in voltage and amperage, but more on that later.

Micro USB connector

Even through the Micro USB → USB adapter, you can easily charge the device from a laptop without any problems.

Voltage and current

All USB connectors are rated for 5V. This means that you can safely connect the charger to the device via micro USB.

The strength of the current is another matter. To charge the device faster, chargers increase the amperage, which is measured in amperes (A). The chargers that come with Android tablets are rated for higher amperage than similar devices for Android smartphones. For example, a charger for a tablet is rated at 2A, while a charger for a smartphone is only rated at 1A.

If you connect a charger from a smartphone to a tablet, the tablet will charge very slowly because there is not enough current to charge it normally. If you try to charge your smartphone through the tablet charger, nothing terrible will happen, and your smartphone will not explode and will NOT light up.

Most likely, the smartphone will not take the maximum possible number of amps that the charger provides, so everything will be fine. Maybe the smartphone will only charge a little faster.

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