Why Do Smartphones Explode, and How Can You Prevent It?

26th March 2025

6 minutes read

Why Do Smartphones Explode, and How Can You Prevent It?

Although the likelihood of your smartphone suddenly catching fire or exploding is quite low, such incidents have occurred in the past and continue to be reported from time to time. One of the most well-known cases involved the Samsung Galaxy Note 7, which was recalled due to a series of battery-related fires. While these occurrences are rare, it is still essential to understand the underlying causes behind smartphone explosions and the steps you can take to prevent them.

Smartphone explosions are primarily linked to issues with their lithium-ion batteries. These batteries, which are used in almost all modern mobile devices, operate based on a delicate balance between positive and negative electrodes. This equilibrium allows energy to be stored and discharged efficiently, making lithium-ion batteries lightweight, powerful, and rechargeable.

However, if this balance is disrupted due to a malfunction, manufacturing defect, or physical damage, an internal short circuit can occur. This can trigger a chain reaction known as thermal runaway, in which excessive heat is generated, potentially leading to combustion or even an explosion.

Primary Causes of Smartphone Explosions

Several factors can contribute to battery failure and overheating, increasing the risk of a smartphone catching fire or exploding:

🔸 Excessive Heat and Overheating: If a smartphone is exposed to high temperatures for prolonged periods—such as being left in a hot car, placed near a heat source, or overused while charging—it can cause the battery to overheat. This may lead to a breakdown of the battery’s internal components, increasing the risk of combustion. Overheating can also result from prolonged gaming, video streaming, or using high-power applications while the phone is plugged in.

Physical Damage to the Battery: Dropping a smartphone repeatedly or subjecting it to extreme pressure (such as bending it or sitting on it) can cause damage to the internal structure of the battery. Even if there are no visible cracks, the battery cells inside could sustain microscopic fractures, leading to internal short circuits over time. If a damaged battery remains in use, it could eventually swell, leak, or even explode.

Thermal Stress and Poor Ventilation: Keeping a phone in a hot environment, such as on a dashboard under direct sunlight, can cause the internal temperature to rise beyond safe limits. Similarly, using a smartphone while it is wrapped in thick materials (such as under a pillow or in a tight pocket) can restrict airflow and contribute to overheating.

Use of Unauthorized or Substandard Chargers and Batteries: Charging accessories that are not certified by the manufacturer, especially cheap or counterfeit chargers, can deliver an inconsistent or excessive voltage, potentially overloading the battery. In some cases, faulty chargers may cause the battery to expand or overheat, increasing the chances of combustion.

Overcharging and Leaving the Phone Plugged in Overnight: Although most modern smartphones have built-in mechanisms to prevent overcharging, some older or defective models may still experience stress when left plugged in for extended periods. Charging overnight on a surface that retains heat, such as a mattress or blanket, can also be hazardous.

Software-Related Malfunctions and Malware: Certain types of malware and poorly optimized apps can overload a phone’s processor, forcing it to run at maximum capacity for extended periods. This increased power consumption can generate excessive heat, putting strain on the battery and internal components.

Manufacturing Defects: While rare, some smartphones may leave the factory with a defective battery due to errors in the manufacturing process. Poorly assembled battery cells can be prone to overheating, swelling, or even catching fire under certain conditions.

Warning Signs That Your Smartphone May Be at Risk of Exploding

Although not all battery failures come with clear warning signs, there are a few red flags that you should never ignore:

Unusual Sounds or Hissing Noises: If your phone starts making popping, crackling, or hissing sounds, this could indicate a problem with the battery’s internal structure.

Burning Smell or Chemical Odor: A strong, burning plastic or chemical smell coming from your device is a serious warning sign that the battery is overheating or leaking.

Excessive Heat During Normal Use or Charging: While it is normal for phones to warm up slightly during use, extreme heat—especially when the phone is idle or charging—should be taken as a sign of possible battery failure. If your phone becomes too hot to touch, disconnect it from the charger immediately and let it cool down.

Swollen or Bulging Battery: If you notice that the back cover of your phone is lifting or if the screen appears to be pushed outward, this could mean the battery has expanded. Swollen batteries should be replaced immediately, as they pose a serious risk of explosion.

Frequent Shutdowns or Rapid Battery Drain: If your phone is shutting down unexpectedly or if the battery is draining unusually fast, it could indicate an internal issue with the battery’s health.

Visible Battery Damage or Leaking Fluid: If you ever notice liquid leaking from your phone or see corrosion near the battery contacts, stop using the device immediately and seek professional assistance.

How to Prevent Smartphone Explosions: Essential Safety Tips

While it may be impossible to completely eliminate the risk, following these precautions can significantly reduce the chances of a smartphone explosion:

Use Only Manufacturer-Approved Chargers and Accessories: Stick to original or certified third-party charging cables and adapters to ensure that your phone receives the correct voltage and current during charging.

Avoid Exposure to High Temperatures: Keep your phone away from direct sunlight, hot car interiors, or heaters. If your phone does overheat, turn it off and allow it to cool down before using it again.

Do Not Overcharge Your Phone: Unplug your phone once it reaches 100% charge. Consider using smart plugs or timers to automatically cut power to your charger if you tend to charge overnight.

Avoid Charging on Soft or Flammable Surfaces: Charge your phone on a hard, non-flammable surface such as a desk or table. Never charge it under a pillow or blanket, as this can trap heat.

Protect Your Phone from Physical Damage: Use a durable phone case and avoid dropping or placing excessive pressure on your phone. If your phone is accidentally dropped, monitor its behavior for any unusual signs of malfunction.

Replace Old or Swollen Batteries Promptly: If your battery starts swelling or shows signs of damage, replace it immediately with a new, genuine battery from an authorized repair center. Never attempt to puncture or dispose of a swollen battery improperly.

Do Not Use Your Phone While Charging for Heavy Tasks: Avoid playing high-performance games or running intensive applications while your phone is plugged in, as this can increase heat buildup.

Keep Your Software and Apps Updated: Ensure that your phone’s operating system and apps are always up to date to prevent software-related overheating issues.

Be Cautious with Public and Fast-Charging Stations: Some public charging stations may deliver inconsistent power output. If possible, use your own charger and avoid using unverified fast-charging methods.

Don’t Ignore Early Warning Signs: If your phone exhibits any symptoms of battery failure, take immediate action. Do not continue using a phone that is overheating, swelling, or emitting smoke.

Final Thoughts

While smartphone explosions are relatively rare, they are not impossible. By taking the necessary precautions and being mindful of how you charge, store, and use your phone, you can minimize the risks and ensure the safety of both yourself and your device. If you ever suspect a battery issue, don’t take chances—have it checked by a professional before it becomes a serious hazard. Your smartphone is an essential part of daily life, and keeping it in good condition will not only extend its lifespan but also protect you from potential dangers.