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How to Find out If Your Phone's Battery Is Bad and How to Act Properly

Updated on July 26, 2017


Have you ever seen your phone behave very strangely? In spite this behavior could be caused by firmware bugs or other hardware problems, it is often caused by a faulty battery. The battery is one of the most important parts of a phone, because it gives it the power it needs to operate, yet it is a component that frequently presents issues.
You can, however, predict if your battery is faulty and needs replacement by checking out for some specific signs. Let’s see which these sings are, how to find a proper battery for your device and how to replace it with the old, defective one.

Display Issues

It is obvious that most display issues are caused by a hardware problem, a faulty screen or a cracked screen. Nevertheless, if your battery has started malfunctioning, your screen brightness might randomly change, even if you didn’t alter any settings. A faulty battery can rarely make your screen behave like it has had a fall and broke (flashing colors in random parts of the screen). So if you see your phone’s screen behave completely strangely without having it hit before, either you have a faulty graphics card/ screen element or just a faulty battery as mentioned above.

Randomly Changing Battery Percentage

After each reboot, you might find your battery percentage changed to a random number, higher or lower than the normal without any actual reason. The only way to make it come back to normal is to reboot your phone a few times. Again, a bad battery is the culprit. In some rare cases, this could be caused by a faulty battery sensor (like it happened with Samsung’s Galaxy Trend Plus model) but, even in this case, replacing the battery fixes the problem.

Random Reboots

One of the most common ‘symptom’ of a faulty battery is random phone reboots. Again, this could be caused by some other bad component or bugs in the firmware but in most cases a faulty battery is the reason that your phone is having random reboots.

Swollen/ Overheating Battery

There is no need to tell much here, it is clearly obvious that if your battery overheats without excessive phone use and if it has started swelling or getting small ‘knobs’, something is wrong with it.

An extreme case of a swollen battery.
An extreme case of a swollen battery.

Reduced Battery Life

The most common sign of a malfunctioning battery is reduced battery life, of course. If you have started to notice that your battery lasts for less, it is certain that there is something wrong with it.

Drawing of a 'dead' battery.
Drawing of a 'dead' battery.

What to to if you have a faulty battery?

If you ever find out that there is something wrong with your battery, you shouldn’t ignore it. It could temporarily leave you without a phone one day, it could leak and damage your phone or, in extreme cases, it could even explode, causing serious damage or injury.
The right thing to do is replace it as soon as you can, of course.

What battery should you get?

There are many types of phone batteries, but the most used is Lithium-Ion battery (Li-Ion).
However, you should search online or check by yourself what exact battery your phone needs. If you are still unsure, you can always ask an expert to tell you.

  • Always buy what your manufacturer recommends about your device.
  • Be careful NOT to buy batteries of the type ‘more capacity that the original’ or OEM batteries. It is better to pay a bit more and have like 1 hour less battery life than risk your and your phone’s safety.
  • Make sure to buy batteries from trusted physical shops. It is generally recommended because that way you are able to check if the new battery is OK or if it has signs that might declare it factory defective. If you can’t go to a physical shop and want to buy online, make sure to buy from trustworthy online sellers and always seek for a ‘Returns Accepted’ notice so that you will be able to return the product if you behold something uncommon on it.

An example of a Li-Ion battery, made by Samsung.
An example of a Li-Ion battery, made by Samsung.

How do you replace your phone's battery?

Again, the procedure totally depends on your model and manufacturer. However, the steps are generally generally the same for every device.

If you have access to the phone’s battery:

  • Backup your important data. This step is very important, there is no data loss danger involved in battery replace procedure but you should always backup your data before you mess with your phone in any way, just in case.
  • Turn off your phone. NEVER attemp anything while your phone is powered on or plugged in.
  • Carefully open the back cover of your phone. Find the small notch and slowly pull it until you completely remove it.
  • Remove the battery.
  • Place the new one, be very careful to place it properly, always depending on the battery and the phone model.
  • After checking that everything is OK, put the back cover the way you removed it.
  • Power up your phone.


In case you are unsure about the procedure contact an expert.

If you do not have access to your phone’s battery:

If you do not have access to the device's battery, take it to a certified technician to replace it. Do not attempt to tear down your phone yourself, unless you are experienced, as severe damage might be caused.

This is it! Your device has now got a new ‘heart’ and is ready to work again.

Important Note

After replacing your battery, make sure to properly dispose the old one by throwing it to a special battery recycling bin. Do not throw it away in the environment or in regular bins as it is very dangerous for our health and the environment itself.

Care for the environment, properly dispose batteries.
Care for the environment, properly dispose batteries.

© 2017 Thomas KTR


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