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Calibrating the battery level on Android. Battery charge on Android does not show correctly: main reasons

đź’ˇ If Android does not show the battery charge correctly, then there will be inconvenience when using the device. , may turn off unexpectedly, even if the percentage of charge is still sufficient to operate. Calibrating the battery will help eliminate the error, but in difficult cases the battery will need to be replaced.

This article is suitable for all brands that produce phones on Android 9/8/7/6: Samsung, HTC, Lenovo, LG, Sony, ZTE, Huawei, Meizu, Fly, Alcatel, Xiaomi, Nokia and others. We are not responsible for your actions.

Reasons for incorrect battery charge display

If you notice that something wrong is going on with the charge numbers, then do not ignore this indicator, but try to determine the reason. It could be:

  • Incorrect battery calibration.
  • Firmware errors.
  • Battery wear.

If the phone has been in use for several years, then most likely the reason for the rapid discharge and incorrect charge level display lies in the condition of the battery. You can try it, but it will be more effective to replace it with a new power source.

To slow down the rate of battery wear, use an original charger and try to charge your phone/tablet from a wall outlet rather than a computer USB.

If errors in determining the charge level appeared after flashing the device, try flashing it again, after charging the battery to 100%. Or install another firmware if you are using custom builds.

Battery calibration in Android phones

What to do if Android has not been flashed, and the device was purchased not so long ago that the battery has become unusable? Calibrate the battery using programs or Recovery Menu.

Calibration is needed to eliminate a failure in which the battery “remembers” incorrect charge limits. As a result, at full capacity, it shows incorrect percentages and quickly discharges.

Without root and recovery

If you don't have it on Android and you don't want to install anything unnecessary, try calibrating the battery using several discharge-charge cycles.

  1. Completely discharge the device. The battery must be in such a condition that when you try to turn on the gadget, it makes a characteristic discharge sound and immediately turns off.
  2. Remove the battery and wait a couple of minutes. If the battery cannot be removed, leave the device turned off for 10 minutes.
  3. Place your switched off phone to charge. Wait until it is fully charged.
  4. Without turning on the device, remove the battery and wait a few minutes. Then reinsert and turn on the phone.

It is advisable to repeat the cycle three times to increase the accuracy of battery calibration. After one time the effect will not be noticeable.

Android battery calibration apps

If manual calibration does not resolve the issue, use the Battery Calibration app.

  1. Install Battery Calibration.
  2. Charge the device to 100%.
  3. Launch the application and click the "Calibrate" button.
  4. Disconnect the charger.
  5. Let your smartphone drain completely.

Working in custom Recovery

If a custom Recovery Menu is installed on your phone, then it should have an item to reset battery statistics. For example, in TWRP you need to open the “Wipe” section and select “Wipe Battery Stats”. There is another way:

  1. Go to the Recovery menu.
  2. Click "Advanced" and open "File Manager".
  3. Go to the data/system directory, click on the batterystats.bin file.
  4. Select “Delete” and confirm the operation by swiping.

It's no secret that modern phone users often have problems with the battery life of Android devices. A smartphone or tablet does not last long. This can lead to a number of negative consequences. Battery calibration can improve the functioning of the problematic component. But what will it take? Is it possible to carry out the procedure yourself? How to calibrate the battery on Android? All this will be discussed further below.

Signs of Problems

In fact, it is important to understand when the user really has problems with the battery on the phone, and under what circumstances the gadget works normally. There are several signs that suggest you should consider calibration.

The first scenario is that the smartphone or tablet begins to turn off on its own when it has a charge. Even 1% is usually enough for autonomous operation. Therefore, you will have to think about how to calibrate the battery on Android.

The second sign that it is recommended to pay attention to is the battery life of the device in offline mode. For example, previously a smartphone could work for a week, then 5 days, and after a month or two - 2-3 days. This behavior is a sure sign of an incorrectly configured battery.

Calibration is...

What is calibration? Electricians are probably familiar with this term. In dictionaries, the concept is deciphered as bringing the device to an optimal state. In other words, this is the setting of a particular device.

In the situation under study, we are talking about setting up the smartphone/tablet battery so that it consumes energy optimally. So how to calibrate the battery on Android?

On your own or with help

To answer the question posed, everyone must decide for themselves exactly how they plan to act. You can calibrate the battery yourself without much difficulty. But beginners or people who are concerned about the safety of their devices are not recommended to take risks.

The point is that if you do it incorrectly, you can end up with a battery that holds too little charge. And this will lead to the loss of functionality of the gadget. Therefore, if there is the slightest doubt, it is recommended to simply take the device to a service center. There, for a reasonable fee, they will tune the battery with 100% safety.

Calibration Methods

However, it is still necessary to know how to calibrate the battery on Android (manually or not - not so important). In fact, there is nothing difficult or special about the procedure. The main thing is to follow the instructions. They will be given below.

In practice, calibration can be done in several ways. Namely:

  • with root access;
  • without root.

You can also classify the work ahead as follows:

  • manual calibration;
  • use of additional programs;
  • working with the engineering menu.

How exactly to proceed? Every person should think about this in advance. Indeed, the success of calibration often depends on the chosen technique. In practice, if carried out correctly, all of the above methods give quick and good results.

CurrentWidget

How to properly calibrate the battery on Android? The first technique is nothing more than working without root. Just a few minutes - and it's done!

The algorithm of actions boils down to the following steps:

  1. Determine the battery capacity. To do this, you need to study any review of your existing smartphone or tablet. The battery capacity in mAh will be written there.
  2. Download an application called CurrentWidget: Battery Monitor from the Play Market.
  3. Install the downloaded program.
  4. Charge the battery to the standard specified by the manufacturer. To do this, the device is connected to the network.
  5. As soon as the desired result is achieved, turn off the phone/tablet. Turn it on immediately.

In fact, such a technique is not always effective. But it is often recommended for novice users. What to do if the method did not help?

Hard Reset

How to calibrate the battery? On Android versions of the OS, there are several methods to bring your idea to life. For example, act using the so-called Hard Reset.

What to do if the previously proposed method turned out to be useless? You can try to fix the battery like this:

  1. Charge and discharge the device completely 5 times.
  2. After the last charge, you need to unplug your phone or tablet and wait a few seconds (about half a minute).
  3. Perform Hard Reset. To do this you will need to go to the engineering menu. Each device has its own method of operation. As a rule, it is enough to hold down the power and volume buttons for a few seconds. Next, select the appropriate operation.

The manipulations performed will help the device perceive the resulting charge level as 100%. Thanks to this, the battery will start working properly.

No apps

How to calibrate the battery on Android without root and additional software? The next technique differs in that you will need to work exclusively with the charger and battery. No additional actions are needed.

Instructions for setting up the battery look like this:

  1. Fully charge the device's battery. After this, be sure to unplug the gadget and turn it off.
  2. Connect the charger cable to the disconnected tablet/phone and charge the device until the LED indicator turns green (indicates 100% charging).
  3. Turn on your phone and stop using automatic display shutdown. On Android, this option is usually disabled in the “Display Settings” - “Sleep Mode” menu.
  4. Charge your device to 100% again with the screen on.
  5. Now you can turn on sleep mode and work with your smartphone.

The actions taken are calibration. Only all of the listed options provide for the absence of root. With root you can configure the battery slightly differently.

Battery Calibration

How? How to calibrate a non-removable battery on Android? Exactly the same as a regular battery. Settings with root rights are considered the most effective. For example, using additional software.

The calibration instructions look like this:

  1. Download and install Battery Calibration. The best way to do this is using the Play Market.
  2. After installation, fully charge the battery.
  3. Open Battery Calibration and check the battery charge. You need to charge your device to 100% in the app.
  4. Click on the "Calibration" button. This should only be done when the smartphone is fully charged.
  5. Reboot the device.

This is where all the manipulations end. But there is another good trick.

Recovery Mode

How to calibrate the battery on Android through the engineering menu? You can use a technique such as working with the device recovery mode.

How will Recovery Mode help you achieve your plans? If you follow the instructions, you can successfully configure the battery of any smartphone.

This requires:

  1. Open Recovery Mode. It turns on if you press the Home button and the volume control at the same time. After this, the device’s power key is additionally pressed. Manipulations are carried out with the phone turned off.
  2. Go to the "Advanced" section.
  3. Find there and go to Wipe battery stats.
  4. Reset all previous calibrations. To do this, select the appropriate menu item.
  5. Discharge the phone/tablet until it turns off completely.
  6. Charge the disconnected gadget to 100%.
  7. Turn on the device (without disconnecting from the network) and click on the "Calibration" button in the Battery Calibration program.

Ready! From now on, it’s clear how to calibrate the battery on Android. In reality, everything is simpler than it seems! Many people say that all of the above techniques are very effective. But most often, old batteries are simply replaced with new ones. This way you don't have to worry about calibrating the battery.

Modern mobile devices only look simple. In fact, each of these compact devices - a tablet, a smartphone or just a mobile phone - represents a whole complex of different systems. Some of them have very high energy consumption. For a tablet, such a module is a block, just like for a smartphone. It is not surprising that even with a large battery capacity, the charge does not last long. You can often come across such a thing as calibrating a tablet battery, which is said to be necessary and even inevitable. Let's see if this is true.

There are situations in which the battery may need to be calibrated. The short list is as follows:

  1. The device began to work for much less time;
  2. After full charging, the indicator on the screen does not show 100% level;
  3. The system displays a decrease in battery capacity in strong jumps;
  4. The tablet turns off due to lack of power, although the indicator does not indicate that the battery is completely discharged, and no warnings are issued.

There may be several explanations for this behavior. Some cases are quite expected - experiments were carried out with the device, for example. Others are not so obvious, and battery calibration may actually be necessary. A short list of symptoms and preliminary actions can be summarized as follows:

  • the firmware with which the system was recorded, which has different battery usage statistics, has changed;
  • the battery has been changed and has different parameters;
  • The tablet battery fails;
  • the power and battery charge controller is acting up;
  • the charger does not provide the necessary parameters;
  • The battery controller gives incorrect readings from the sensors that Android uses.

There is no point in compensating for the last four points. Needs renovation. But the whole catch is that the behavior of the tablet is difficult - in the electronics or the software part. Therefore, before going to a service center, it is better to resort to simpler methods.

Most popular method

If the firmware is changed, the best answer to the question of how to calibrate the battery on Android will sound very simple. You need to reset the battery usage statistics and force the system to create the file again.

There is a popular and quite widespread - the Battery Calibration program. It acts radically and simply, forcing Android to recognize the battery as the first and only one and set the power system parameters in accordance with its characteristics.

The application will need root access to delete statistics. Battery Calibration can be downloaded from PlayMarket, it is easy to install and does not require configuration. You won’t have to spend a lot of time figuring out how to calibrate the battery on your tablet either. as follows:

  1. Install Battery Calibration;
  2. Fully charge the tablet when turned off;
  3. Turn on the device and launch the program;
  4. In front of us is a single button. Click;
  5. Battery Calibration will ask for a superuser name.

Video on how to use the Battery Calibration app:

By specifying the required data and confirming the choice, the user initiates overwriting the statistics file and creating parameters that are responsible for only 100% battery charge. Then the system will do everything itself according to the readings of the battery controller.

Meticulous and attentive users began to ask questions to the “author” - Google. They concerned, first of all, the effectiveness of using Battery Calibration and similar programs. As expected, the company recognized the method as the least effective, giving an acceptable result only when the following factors are combined:

  • normal battery condition;
  • correct operation of the power controller;
  • reliable battery sensor readings;
  • normal operation of the charger.

The method proposed by Google to calibrate the battery on Android is quite complicated. Judge for yourself:

  1. or smartphone. The process must continue for at least 8 hours, even if the system signals that charging is complete. The device must be turned on;
  2. Disconnect the charger or unplug it from the outlet. Turn off your tablet or smartphone;
  3. Start the charging process again and continue for an hour;
  4. Disconnect the charger and turn on the tablet or smartphone. Keep it in this state for a minute or two;
  5. Turn off the device and charge again. Continue for an hour;
  6. Physically disconnect the charger cable and turn on the smartphone or tablet.

It looks strange at first glance. But everything is rational and simple. In this way, statistics are recreated and hardware parameters are adjusted as much as possible to suit all conditions.

  • From a physical point of view, everything looks like this:
  • after the first point, the battery gains capacity, which corresponds to the maximum controller readings recorded in system statistics;
  • the second point relieves the load, all consumers are disconnected;
  • the third point performs additional charging with optimal current and voltage under hardware control of the power chip;

the fourth point forces the system to update statistics, since sensor readings may not correspond to previously recorded ones;

The actions of the fifth and sixth points are control ones. They are intended mainly for complex devices whose power management systems use operating system statistics. The last two steps allow you to truly charge the battery completely. And turning on the smartphone or tablet again records a new maximum of indicators in the statistics if they have changed.

As you can see, this can be done periodically if the battery loses capacity.

other methods

There are a number of programs similar in principle to Battery Calibration. But resetting statistics parameters, as described above, does not always work well.

Which display the indicators of battery monitoring sensors in numerical form. One of them is Battery Monitor. It displays the current battery charge in milliamp-hours. It is recommended to charge the battery until the program readings match the maximum capacity written on the battery.

The program works great, but anyone who decides to learn how to calibrate the battery on Android is likely to encounter problems. If we are talking about improper operation of the power controller or a drop in battery performance, then in accordance with the recommendations, you can repeat the charging/discharging process forever. And to no avail.

What to do?

In order not to wander around in three pines, wondering why the tablet began to work for less time or behaves incorrectly, use the method proposed by Google. This tablet battery calibration is completely safe.

Perhaps the problems will disappear; in any case, the repetition of similar symptoms after some time will clearly signal hardware problems. But if you conducted experiments: changed the firmware or changed the power management parameters, resetting the statistics using Battery Calibration is acceptable and will give good results.

In the summer of 2012, two great events related to gadgets happened to me. Firstly, my beloved IPad 2, which had served me faithfully for a year before, was stolen from me and it was replaced with a Chinese craft called Ainol Aurora 2.

Of course, this unit was not even close to an iPad, but I bought the Aurora for slightly different purposes. I love reading e-books and documentation, but all kinds of e-readers, to put it mildly, did not suit me. I'm used to carrying my iPad almost everywhere, either reading, watching movies, playing games, or testing my applications on it. In the end, I realized that this kind of device requires a relatively small screen - 7 inches, otherwise it will be too bulky. In addition, it was important that it not be stolen.

And so, after thinking and weeding out the Samsung Galaxy Tab 2 with a 7-inch screen (they will definitely help me part with it), I decided to contact Chinese consumer goods.

Before this, I had never bought any phones or tablets with proud names like “Samcung”, “Nokla”, “Iphung”, “IPed”, etc. However, after scouring the Internet, I found reviews about the Ramos company, which I then wanted to buy. I placed an order on Hammer and the seller did not have the Ramos model that I needed. He suggested an analogue of this Ramos - Ainol Elf 2. Googling again, I found out that this Elf does not have an IPS screen, and without it there was no point in taking the tablet. Then it was proposed to buy Aurora 2.

And so, 15 days later, Aurora came to me by the Singapore postal service. There is no point in describing this device - there are a lot of reviews of all stripes on the Internet. On my own behalf, I can only add that Aurora 2 was completely suitable for my needs. The only thing that bothered me was the heating of this device.

While testing the device, I was amazed at its relatively high performance. I couldn’t wrap my head around the fact that for five thousand I got a very powerful device. Yes, after the iPad you could find fault with Aurora endlessly, but for the money it was simply gorgeous.

Having been using the device for two months, I did not notice any glitches that I had previously feared. Games, movies, books - everything could be done on this tablet. Even some of my friends, having learned its price, wanted to buy it for themselves.

And here China made itself felt - I caught the first serious glitch, which took me almost three hours to fix. This is about frozen charge indicatorAinolAurora 2.

An extremely unpleasant thing, I tell you. The charge indicator always shows 100%, then the Aurora simply turns off (the battery is discharged). What is the most dangerous thing in this situation is that batteries cannot be allowed to discharge at all, and then what can we say about Chinese crafts? In general, being afraid that in a month I would throw away the Aurora because I would kill its battery (I doubt that I could find a replacement for it), I had to take measures to eliminate this scourge.

I once worked in a service center and I know that almost all tablets have a soldered battery. What I mean is that my first thought was to remove the battery and reinsert it. However, the thought that I might damage this cool case during disassembly made me look for other options.

Previously, on phones, a similar problem was solved by flashing the device. I wanted to do the same, but on one English-speaking forum where I was looking for firmware, I was told to do the following:

  1. Having root rights, launch any convenient terminal emulator (command line).
  2. After launching the terminal, make sure that you have root permissions. For those who don’t know, in Nix the invitation line for a super user (root) begins with the # sign, and for a regular user - with $. If you are logged in as a regular user, you need to enter su and press Enter. The prompt line will now start with a # symbol, which is what we need.
    1. With a terminal open, enter echo B8 > and press Enter.
    2. Next enter echo B820 > /sys/devices/i2c-2/2-0034/axp20_reg and press Enter.
    3. Reboot your tablet.
    4. The battery charge indicator will show the charge level 5% .
    5. Connect the charger and charge the tablet fully.

It seems like a simple manipulation that any Unixoid can do. However, I encountered a problem with root unlocking, which is disabled by default. To get it, you will need an external flash card, a file that you need to put in the root of the flash drive and a little time.

  1. Turn on Aurora by holding the power button and the “-” key on the volume control.
  2. After waiting until the gutted Android appears on the screen (its stomach will be opened)
  3. A service menu will appear in which you will need to select the item using the same volume control button apply update from sdcard and confirm your choice with the power button. The system will prompt you to select the desired file, which we will feed it with our elf2_root.
  4. The system will quickly flash and you can now reboot it by clicking the “+” key (personally, I rebooted it right away in the root menu).

In general, root is an extremely useful thing on Android devices, especially on Chinese ones. There are a lot of firmwares that already have these rights. Now that I got rid of the problem of the frozen battery indicator on the Aurora 2, I’m thinking about changing the firmware to a custom one.

I hope this method will help you too.

What are the car battery charge indicators?

The battery plays a key role in starting a car engine. And how successful this launch will be largely depends on the state of charge of the battery. How many of us monitor the battery charge level? It’s called, answer this question for yourself. Therefore, there is a high probability that one day you will not start your car due to a dead battery. Actually, checking the state of charge itself is not difficult. You just need to periodically measure with a multimeter or voltmeter. But it would be much more convenient to have a simple indicator showing the battery charge status. Such indicators will be discussed in this material.

Technology does not stand still and automotive manufacturers are trying their best to make car travel and maintenance as comfortable as possible. Therefore, on modern cars, in the on-board computer, among other functions, you can find data on the battery voltage. But not all cars have such capabilities. Older cars may have an analog voltmeter, which makes it quite difficult to understand the condition of the battery. For beginners in the automotive business, we advise you to read the material about.


Therefore, all kinds of battery charge indicators began to appear. They began to be made both on batteries in the form of hydrometers and additional information displays on the car.

Such charge indicators are also produced by third-party manufacturers. They are quite easy to place somewhere in the cabin and connect to the on-board network. In addition, on the Internet there are simple schemes for making charge indicators with your own hands.

Built-in battery charge indicator

Built-in charge indicators can be found mainly on. This is a float indicator, which is also called a hydrometer. Let's see what it consists of and how it works. In the photo below you can see how this indicator looks on the battery case.



And this is what it looks like when you take it out of the battery.

The structure of the built-in battery indicator can be schematically represented as follows.

The operating principle of most hydrometers is as follows. The indicator can show three different positions in the following situations:

  • As the battery charges, the density of the electrolyte increases. In this case, a float in the shape of a green ball rises up the tube and becomes visible through the light guide into the indicator eye. Typically, the green ball floats up when the battery charge level is 65 percent or higher;
  • If the ball sinks in the electrolyte, it means the density is below normal and the battery charge is insufficient. At this moment, a black indicator tube will be visible through the “eye” of the indicator. This will indicate the need to charge. Some models add a red ball that rises up the tube at a reduced density. Then the “eye” of the indicator will be red;
  • And another option is to lower the electrolyte level. Then the surface of the electrolyte will be visible through the “eye” of the indicator. This will indicate the need to add distilled water. However, in the case of a maintenance-free battery, this will be problematic.





This built-in indicator allows you to make a preliminary assessment of the battery charge level. You should not rely entirely on the hydrometer readings.

  • If you read numerous reviews about the operation of these devices, it becomes clear that they often show inaccurate data and quickly fail. And there are several reasons for this:
  • The indicator is installed in only one of the six battery cells. This means that you will have data on density and degree of charge for only one jar. Since there is no communication between them, one can only guess about the situation in other banks. For example, in this cell the electrolyte level may be normal, but in some others it may be insufficient. After all, the evaporation of water from the electrolyte differs among the banks (in the extreme banks this process occurs more intensely);
  • The indicator is made of glass and plastic. Plastic parts may warp when heated or cooled. As a result, you will see distorted data;

The density of the electrolyte depends on its temperature. The hydrometer does not take this into account in its readings. For example, on a cold electrolyte it may show normal density, although it is reduced.

Factory battery charge indicators

Today on sale you can find quite interesting devices for monitoring the battery charge level by its voltage. Let's look at some of them.

Battery charge level indicator DC-12 V

This device is sold as a construction kit. It is suitable for those who are familiar with electrical engineering and a soldering iron. The DC-12 V indicator allows you to check the charge of the car battery and the functioning of the relay regulator. The indicator is sold as a set of spare parts and can be assembled independently.

The cost of a DC-12 V device is 300-400 rubles.

  • Main characteristics of the DC-12 V indicator:
  • Voltage range: 2.5─18 volts;
  • Maximum current consumption: up to 20 mA;