Can lithium batteries leak? Revealing the truth and tips for safe use

Können Lithiumbatterien auslaufen? Enthüllung der Wahrheit und Tipps für den sicheren Umgang

Lithium batteries have revolutionized the way we power our devices, from smartphones to electric vehicles. Their compact size and impressive energy storage capabilities have made them incredibly popular. However, concerns about safety, particularly their propensity to leak, remain a topic of interest.

In this article, we get to the bottom of the reality of lithium battery leaks and give you valuable tips for safe handling.

Can lithium batteries leak?

Lithium-ion batteries are generally safe and have a low risk of leakage. However, as with any battery, there is still a small risk of leakage. Therefore, it is important to take precautions to minimize this risk. It is important to ensure that the voltage supplied by the battery is suitable for the device being used and that the device can tolerate the voltage of the battery.

Lithium batteries are great for powering devices for extended periods of time, and leaving them connected to the mains for long periods of time will not affect their functionality. Unlike alkaline batteries, lithium batteries do not emit gas when exposed to high pressure and humidity.

To prevent leakage, proper handling of lithium batteries is necessary. They should be stored in a dry and cool place with a charge level of between 50 and 70 percent when stored. It is important to choose reliable manufacturers, avoid physical damage to the batteries, use appropriate chargers, and dispose of damaged batteries properly.

Overall, lithium batteries are safe to use when used and cared for properly. Due to their portable nature and reliability, they are widely used in various applications. Under normal conditions they are generally tight.

What causes a lithium battery to leak?

Lithium-ion batteries are generally designed to be leak-proof under normal conditions. However, there are some factors that can potentially cause leaks:

Physical damage

If a lithium-ion battery is physically damaged, such as by being punctured or crushed, leakage can occur. Damaged batteries should never be used and should be disposed of properly.

Manufacturing defect

In rare cases, manufacturing defects can result in faulty seals or improper assembly of the battery, resulting in leaks. That's why it's important to choose reputable manufacturers and avoid counterfeit products.


Overcharging a lithium-ion battery can cause it to become unstable and possibly leak. To prevent such situations, using approved chargers and avoiding overcharging is crucial.

Exposure to extreme temperatures

Extreme temperatures, both high and low, can compromise the integrity of the battery and potentially lead to leakage. To ensure their safety, it is important to store and use lithium-ion batteries within the recommended temperature range.


Over time, lithium-ion batteries can weaken and lose their ability to hold a charge. As you age, your risk of leakage may increase.

It is worth noting that although the risk of leaks is low, it is important to take precautions to minimize potential risks associated with lithium-ion batteries.

How to prevent lithium batteries from leaking?

To prevent lithium batteries from leaking, you should follow these guidelines:

Choose reputable brands

Buy lithium batteries from trusted manufacturers like Timeusb who have a track record of producing high quality and reliable batteries.

Proper storage

Store lithium batteries in a cool, dry place, away from direct sunlight and extreme temperatures. Ideally the temperature should be between 15 and 25°C (59 and 77°F). Avoid storing in humid or hot environments.

Prevent physical harm

Avoid dropping lithium batteries or subjecting them to shock or physical stress as this may damage the battery case and cause leakage.

Use suitable chargers

Always use the charger provided by the battery manufacturer or a compatible charger recommended for the specific battery type. Using incompatible chargers may result in overcharging, overheating and possibly leakage.

Avoid overcharging

Do not overcharge lithium batteries as this may result in the release of gases, breakdown of the electrolyte and possible leakage. Once the battery is fully charged, disconnect it from the charger.

Replace damaged batteries

If you notice signs of physical damage, such as: b If the battery is full or leaking, replace it immediately. Do not attempt to use or charge damaged batteries.

Follow device-specific guidelines

Different devices may have specific requirements for the type of lithium battery to be used. When selecting and using batteries for specific devices or applications, follow the manufacturer's guidelines and recommendations.

Proper disposal

When disposing of lithium batteries, do not throw them in the regular trash. Instead, take them to designated battery recycling centers or follow local battery disposal regulations.

By following these precautions, you can minimize the risk of leakage and ensure safe use of lithium batteries.

The possible reasons for the leakage of various types of lithium batteries

Cylindrical lithium battery

For cylindrical lithium batteries, two main reasons for leaks are excessive internal pressure and inadequate external packaging.

Battery manufacturing process

During the battery manufacturing process, the following problems may cause battery leakage:

  • Inadequate or faulty welding of the battery case and cover, resulting in unsealed weld spots or cracks in the welds.
  • Incorrectly sized or unsuitable material was used for the sealing steel ball that is supposed to seal the battery tightly.
  • Loose or poorly riveted positive electrode on the cap, resulting in gaps and inadequate elasticity of the insulating gasket, which is also susceptible to corrosion and aging.

Battery Usage

Leakage may occur during use of the battery for the following reasons:

  • Use of non-original batteries with too high a voltage or current.
  • Frequent physical impact on the battery during normal use, which may weaken the internal structure.
  • Unusual charging methods such as overcharging or high current discharge may damage the battery's high current protection system.
  1. Lithium battery bag

The packaging process is crucial for sealing lithium batteries in bags as it directly affects their performance.

To understand the main causes of lithium pouch battery leakage, we need to analyze the specific type of leakage. In general, the causes of aluminum-plastic film leaks can be divided into three categories:

(1) Chemical corrosion

  • Moisture reacts with the electrolyte and produces HF (hydrofluoric acid).
  • HF is highly corrosive and can damage the aluminum plastic foils, liquid collectors and cathode materials.

(2) Electrochemical corrosion

  • Leaks caused by electrochemical reactions are initially difficult to detect.
  • Over time it becomes more serious.
  • This failure mode has a long latency, which can lead to a loss of customer trust.
  • Two conditions can lead to electrochemical corrosion:
    • a) Ion short circuit: An ion short circuit channel forms between the aluminum layer of the aluminum plastic film and the anode.
    • b) Electronic short circuit: The aluminum layer of the aluminum plastic film forms an electronic short circuit channel with the anode.
    • c) Accidental contact between the ear of the negative electrode and the aluminum layer can also lead to corrosion and subsequent leakage.

(3) Physical reasons

  • Overcharging, excessive discharging and high temperature use.
  • Pricks and impacts.
  • Battery swells.
  • Ageing of the sealant, leading to cracks in the seal.

How to tell if a lithium battery is leaking or not?

There are a few methods to determine whether a lithium battery is leaking or not:

Visual inspection

Check the battery for signs of leaks, such as: b visible liquid or stains on the battery case. A leak may appear as a powdery substance, a sticky residue, or even a noticeable bulge.


If the battery leaks, a characteristic chemical smell may occur. However, this method may not be reliable as some leaks may not have a strong smell.

Voltage drop

If you have access to a voltmeter, measure the voltage of the battery. If the voltage is significantly below the battery's rated voltage, it may indicate a leak or internal damage.

Performance issues

If the battery leaks, it may affect its performance. Look for signs of reduced capacity, shortened runtime, or a sudden drop in voltage during use.

Contact with skin

Although not recommended, accidentally touching a leaking battery with bare hands may cause a burning sensation or skin irritation due to the harsh chemicals.

Steps to follow if battery leak persists

Procedure in case of battery leak:

Take the leaked battery out of service and ensure proper disposal to avoid possible damage to people or equipment. Take necessary precautions to prevent water from entering the battery compartment.

If the battery is outdoors, cover it securely with a sturdy tarp or other suitable material.

Have the battery removed and replaced on a vehicle immediately to protect other devices and prevent water ingress.

Contact the battery manufacturer for instructions on how to dispose of the leaked battery safely and responsibly.

If the battery continues to leak, turn off the device immediately and disconnect it from the battery. Remember that a leaking battery could potentially cause a fire hazard or the release of toxic fumes. It is recommended to have a fire extinguisher nearby when charging or servicing batteries.

Dealing with a leaking lithium battery

If you encounter a leaking lithium battery, quick and proper handling is essential to minimize the risk. Here are the steps you should take:

  • Safety first: Put on protective gloves and goggles to prevent direct contact with the leaking material.
  • Decommissioning: Safely disconnect the battery from any device or device it supplies power. This will prevent further damage or potential damage.
  • Do not touch the spilled substance: Lithium-ion batteries contain corrosive electrolytes that can be harmful to skin and eyes. Avoid direct contact and take precautions to prevent accidental ingestion or inhalation.
  • Insulate the battery: Place the leaking battery in a non-flammable and leak-proof container. If possible, use a container specifically designed for battery storage or a plastic bag with a seal to prevent leaks from spreading.
  • Proper disposal: Contact your local waste disposal authority or a dedicated battery recycling center for safe disposal instructions. Lithium-ion batteries should never be thrown into regular trash cans.
  • Avoid contact with water: Do not expose the leaking battery to water or other liquids. Moisture can react with the chemicals and cause further damage.
  • Contact the manufacturer: Inform the battery manufacturer about the leaking battery, they can advise you on proper disposal and provide help or recommendations.
  • Equipment Shutdown: If the leak persists or poses a threat to nearby equipment or equipment, it is important to initiate an equipment shutdown and disconnect the device from the battery.
  • Fire Safety: Always have a fire extinguisher nearby when charging or servicing the battery. In the event of a fire or smoke, evacuate the area and contact emergency services immediately.

How to prevent lithium batteries from leaking?

To prevent your lithium batteries from leaking, follow these simple precautions:

  • Store lithium batteries in a dry and cool place to extend their lifespan and reduce the risk of leakage. Keep the temperature between 0 and 25 degrees Celsius.
  • Avoid overcharging the batteries as this may result in leakage. Use a lithium-ion battery charger with built-in safety mechanisms to prevent overcharging.
  • Check your batteries regularly for signs of damage or failure. Immediately replace any batteries that show cracks, holes, or other damage.
  • Keep your lithium batteries away from metal objects to avoid short circuits that can discharge the battery and potentially cause it to leak.
  • Use the correct battery type recommended for your device to avoid leakage. Make sure the lithium-ion battery you choose is suitable for your specific device.
  • Handle your batteries carefully and avoid dropping or damaging them, as this may result in leakage or damage to your device.

Always follow the battery manufacturer's instructions and guidelines. If you have any doubts or questions, consult an expert before trying any unknown procedures. Avoid purchasing batteries from unreliable sources as this may compromise the quality.

What type of lithium battery is least likely to leak?

Lithium iron phosphate batteries (LiFePO4) are considered the least likely source of leakage compared to other types of lithium batteries.

Lithium iron phosphate batteries (LiFePO4 or LFP) are known for their excellent safety properties. LFP batteries are less likely to experience thermal runaway, which is a major safety risk with other types of lithium batteries. While LFP batteries are generally considered safer and less prone to leakage, it is important to note that no battery is completely immune to failure or leakage.

LFP batteries use iron phosphate cathode material, which is more stable compared to other types of lithium batteries. This stability helps minimize the risk of leaks and thermal runaway. Additionally, LFP batteries have a wider operating temperature range and longer lifespan compared to other lithium batteries, making them a popular choice for applications where safety and longevity are a priority.

Timeusb offers high quality LiFePO4 deep cycle batteries with a life cycle of up to 4000-15000 and a lifespan of 10 years.

Find out more reviews of Timeusb.


While it is true that some types of lithium batteries can leak under certain circumstances, leaks are rare with LiFePO4 batteries due to their inherent stability and safety features. By choosing reputable manufacturers, storing batteries properly, avoiding physical damage, and using appropriate chargers, you can significantly reduce the risk of leaks and ensure the safe and reliable use of lithium batteries. Always prioritize safety when handling any battery and follow the manufacturer's guidelines to reap the benefits they offer.