Checking The Battery Status On Your Smartphone And Tablet

Checking The Battery Status On Your Smartphone And Tablet

The batteries in smartphones and tablets have a limited life, and over time, it becomes necessary to check the status of the battery. Manufacturers report estimated operating times of 400-600 discharge and charge cycles. But how to understand how much the power source has worked and when replacement is required? To do this, use a number of simple methods that will tell you about the current state of the battery and when the time for replacement will come.


If you notice that during the night in standby mode the smartphone lost 15-20% of the charge, this is not a cause for concern. Make sure that applications in the background were not working at this time. To do this, go to the device settings, then the battery item (in some models the location of the items is different). Under the graph, a power consumption scale will be displayed, which shows what led to the discharge: Wi-Fi, GPS navigation, screen operation or active mode.

If the “active mode” scale is inactive, then the application or process that awakened the device led to energy consumption. BetterBatteryStats (requires ROOT to work) will calculate what caused the increased energy consumption.

Use safe mode, in case the device is without ROOT. Leave the device without a load for a day and monitor the energy consumption, also probe the area where the battery is installed. Discharging in 2-8 hours and a slight heat release indicates a malfunction of the battery and requires replacement.

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Battery visual inspection

Remove the battery cover, if it is provided by the design, inspect the battery for deformation and swelling. It is difficult to detect the first signs of swelling, since the visual increase does not exceed 0.5-1 mm. Therefore, press the battery against a flat surface and look for any gaps. Insert a sheet of paper, if it turns out at the ends, but is not in the center or vice versa, then the battery is deformed.

Another way to detect bloating is to scroll through the battery. Put the battery on a flat surface and scroll. If you notice a slight rotation, this is a sign of deformation and a signal to replace the battery. It is also worth paying attention to corrosion around metal contacts, greenish or white spots.

If the power source is installed inside and swollen, the case is deformed. There will be distortions, backlashes and irregularities. In this case, contact a service center, or disassemble and remove the battery yourself.

Important! Do not use the battery with obvious signs of damage (bloating, corrosion). Spilled electrolyte will damage the device or cause ignition.

USB Battery Tester

It is worth noting that lithium-based batteries are aging, even if not used. With proper operation and storage, batteries lose 5-7% of capacity per year, but with temperature changes and improper use, the resource is reduced to 60% in 3 months. To find out how much battery can save energy, a USB tester will help.

Discharge the smartphone or tablet until it turns off, then connect it to the charger. Install a USB tester between the power supply and the cable. Upon reaching 100% charge, look at the number of mAh, this is the current battery capacity. Also pay attention to the initial current strength. If instead of 1 A, which is given by a 1000 mAh power supply, 0.1-0.3 A is displayed, the battery is faulty. To make sure finally, check again with a different charging and USB cable.

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Read more about USB tester testing in a separate article – How to find out the exact battery capacity of a smartphone and tablet

Software testing

This method does not guarantee the identification of a faulty battery, but is useful to users where the battery cannot be removed.

Download an application on Google Play that can tell you about the state, temperature and voltage of the battery. Use Battery Monitor Widget, Battery or Ampere Run the program and look at the values ​​of the power source. If the condition is “Good”, the battery does not need to be replaced.

Checking The Battery Status On Your Smartphone And Tablet

Battery calibration

If the battery indicator does not work or displays incorrect values, a sharp jump in the readings – make a full cycle of discharging and charging the battery. Also calibrate the battery if the device is superuser. To do this, follow the instructions:

  1. Charge the battery at 100% with a wall charger and do not unplug it.
  2. Use the file manager to delete the file “batterystats.bin”, along the path / data / system /.
  3. Turn off the device, unplug it and unplug the battery.
  4. After 3-10 minutes, plug in the charger and wait until the device starts up. After the “insert battery” icon appears, install the battery and allow it to charge until the charging value reaches 100%. After, leave it for another 15 minutes, and then boot the device.

Important! If removing the battery is not provided for in the design, skip the step and follow the instructions further. Other 4 ways to calibrate the battery on android.

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If calibration, the discharge-charge cycle did not help, change the firmware. If the condition does not change, change the battery.


Power supplies in smartphones and tablets are degrading daily, and life and capacity are being reduced. Five simple tips will help you distinguish where the battery is unusable and where the battery is old. And to extend the life of the battery, read "How to use lithium-ion batteries."