Can Lithium Batteries Catch Fire When Not in Use? Battery Safety Explained

Lithium batteries power many of the devices people rely on daily, from smartphones to portable chargers. A common concern is whether these batteries can catch fire even when not in use. Understanding the risks and how to handle these batteries safely can help prevent accidents and keep devices working well.

This article breaks down the basics of lithium battery safety, explains why fires can happen, and offers practical tips for storing and maintaining batteries. Whether you use power banks, charging docks, or other mobile power accessories, knowing how to care for lithium batteries is essential.

How Lithium Batteries Work And Why They Can Be Risky

Lithium batteries store energy using chemical reactions inside cells. These cells have positive and negative electrodes separated by an electrolyte. When the battery is in use, ions move between the electrodes to create electrical power.

Even when not in use, lithium batteries contain stored energy that can sometimes cause problems. The risk of fire comes from a process called thermal runaway, where the battery overheats uncontrollably. This can happen due to damage, manufacturing defects, or exposure to extreme conditions.

What Causes Thermal Runaway?

• Physical Damage: Dropping or crushing a battery can damage internal components, leading to short circuits.
• Manufacturing Flaws: Poor quality control can cause internal defects that increase fire risk.
• Extreme Temperatures: High heat can trigger chemical reactions inside the battery, while freezing temperatures may cause internal damage.
• Overcharging or Deep Discharge: Overcharging can trigger thermal runaway if the battery’s protection circuitry fails. Deep discharge, on the other hand, can degrade the battery and reduce its lifespan.

Why Fires Are Rare When Batteries Are Stored Properly

Modern lithium-ion batteries include multiple safety layers, such as internal separators and battery management systems, designed to reduce the risk of overheating. Fires are still possible, but they are uncommon when batteries are undamaged, used with appropriate chargers, and stored in safe conditions.

The Role of Battery Management Systems

Advancements in battery management systems (BMS) play a crucial role in enhancing safety. These systems monitor the battery's voltage, temperature, and overall health, ensuring it operates within safe parameters. If any irregularities are detected, the BMS can automatically cut off power or adjust charging rates to prevent dangerous situations. This technology not only extends the battery's lifespan but also provides an extra layer of protection against potential hazards.

Recycling, Disposal, and Consumer Awareness

The rise of lithium battery recycling programs is contributing to safer disposal practices. Many manufacturers are now implementing take-back schemes that allow consumers to return old batteries for proper recycling. This not only mitigates environmental concerns but also ensures that batteries are handled safely at the end of their life cycle, reducing the risk of fires from improper disposal. As awareness grows, consumers are becoming more educated about the importance of responsible battery usage and disposal, further enhancing overall safety in the use of lithium batteries.

Can Lithium Batteries Catch Fire When Not In Use?

It is uncommon, but lithium batteries can catch fire even when they are not actively powering a device. This usually happens if the battery has been damaged or exposed to unsafe conditions before storage.

For example, a battery left in a hot car or near a heat source might degrade internally. Over time, this damage can lead to short circuits or chemical breakdowns that cause fires. Similarly, batteries stored fully discharged for long periods can lose capacity or become unable to recharge properly, which affects performance.

Signs a Stored Battery Might Be Unsafe

• Swelling or bulging of the battery casing
• Unusual smells, such as a chemical or burning odor
• Visible corrosion or leakage
• Excessive heat when touched

If any of these signs appear, it is best to stop using the battery and dispose of it according to local regulations.

Best Practices for Storing Lithium Batteries Safely

Proper storage is key to reducing the risk of fire and prolonging battery life. Follow these guidelines to keep your lithium batteries safe when not in use.

Store Batteries in a Cool, Dry Place

Avoid exposing batteries to direct sunlight, heat sources, or humid environments. Ideal storage temperatures are generally between 15°C and 25°C (59°F to 77°F). Extreme temperatures can damage battery cells and increase fire risk.

Keep Batteries Partially Charged

Storing batteries at around 40-60% charge helps maintain their health and reduces stress on the cells. Avoid leaving batteries fully charged or completely drained for extended periods.

Use Protective Cases or Containers

Prevent physical damage by storing batteries in cases or containers that protect them from drops, impacts, or contact with metal objects that could cause short circuits.

Separate Batteries From Metal Objects

Keep batteries away from keys, coins, or other metal items that might touch battery terminals and create a short circuit.

How Safer Battery Technologies Reduce Fire Risks

Traditional lithium-ion batteries use liquid electrolytes that can ignite if damaged. Newer designs, including semi-solid-state batteries, use less flammable materials that improve safety.

What Is Semi-Solid-State Battery Architecture?

Semi-solid-state battery architecture reduces the amount of free-flowing liquid electrolyte compared to traditional lithium-ion designs by using a more stable, gel-like electrolyte system. BMX SolidSafe™ products reduce electrolyte content to approximately 2.5%, improving thermal stability and helping lower the risk of leakage, overheating, and conditions that can lead to thermal runaway. Better Mobile Xperience built SolidSafe™ around semi-solid-state battery architecture to deliver safer, high-performance mobile power for real-world everyday use.

Durability and Controlled Power Delivery

Beyond battery chemistry, product design also plays a role in safety. SolidSafe™ uses an aluminum enclosure designed to help protect the battery from impacts and support heat dissipation during charging. SolidSafe™ also supports USB-C Power Delivery (PD) and Qi2-certified wireless charging for reliable power delivery, and proper chargers and safe handling further help reduce the risk of overheating during use and storage.

Practical Tips for Everyday Battery Safety

Handling lithium batteries carefully can prevent many common issues. Here are some practical tips to keep in mind.

Inspect Batteries Regularly

Check your batteries for any signs of damage or wear before use. If a battery looks swollen or damaged, do not use it.

Follow Manufacturer Guidelines

Use chargers and accessories recommended by the battery manufacturer. Avoid cheap or uncertified chargers that might deliver inconsistent power.

Do Not Expose Batteries to Water

Water can cause short circuits and corrosion. Keep batteries dry and avoid using devices with wet batteries.

Dispose of Batteries Properly

When a battery reaches the end of its life, recycle it at designated collection points. Do not throw batteries in regular trash bins.

Frequently Asked Questions About Lithium Battery Safety

Can a Lithium Battery Explode If Left Unused for a Long Time?

It is unlikely for a lithium battery to explode simply because it is unused. However, long-term storage without proper care, such as storing fully discharged or in extreme temperatures, can damage the battery and increase risks.

Is It Safe to Store Lithium Batteries in a Car?

Cars can experience high temperatures, especially in summer. Storing lithium batteries in a car is not recommended due to heat exposure, which can degrade the battery and increase fire risk.

How Should I Charge My Battery Before Storing It?

Charge the battery to about 40-60% before storing. This level helps maintain battery health and reduces stress on the cells.

What Should I Do If My Battery Is Swollen?

Stop using the battery immediately. Do not puncture or try to fix it yourself. Take it to a proper recycling or disposal facility.

Are Semi-Solid-State Batteries Completely Fireproof?

No battery technology is completely free from risk. Semi-solid-state batteries reduce the likelihood of fire compared to traditional lithium-ion batteries, but safe handling and storage are still important.

Understanding Battery Safety for Peace of Mind

Lithium batteries are powerful and convenient, but require respect and care. Fires from unused batteries are rare when products are designed with safety in mind and stored properly. Advances in battery technology, such as semi-solid-state architecture, help lower risks without compromising performance.

Using trusted brands that prioritize safety, like Better Mobile Xperience, and following best practices for storage and handling can keep mobile power reliable and secure. Discover safer power solutions that fit your lifestyle and give you confidence in your mobile devices every day.