What to do if you have a swollen battery?

You should remove and dispose of a swollen battery from your device as soon as possible. Here, we explain step by step how to identify a swollen battery, remove it safely, dispose of it correctly and get your device working again with a high-quality replacement battery from Electropapa.

Can a swollen battery explode?

This is a question that understandably concerns many users. The answer is clear: yes, in the worst case, a swollen battery can explode or catch fire. 

A swollen battery indicates that a chemical reaction is taking place inside the cells. This reaction produces gases that build up inside the sealed battery casing. If the pressure becomes too high or the battery is physically damaged, thermal runaway can occur. If, for example, a lithium battery has swollen, as can happen with the batteries used in most smartphones, tablets, laptops and power banks, extreme caution is required. This is because it poses an increased risk of fire, explosion and chemical reactions, even when it is no longer being actively used.

Important: Stop using your device immediately if you notice any swelling, even if you only want to make a quick backup of your data. Your safety should always come first!

Why does a battery swell in the first place? 

A battery can swell for various reasons. In most cases, an unstable chemical reaction that produces gas is responsible. Here is an overview of the main causes:

• Overcharging: A faulty or unsuitable charger can overcharge the battery and trigger chemical reactions.
• Deep discharge: A battery that remains completely discharged for too long can also become damaged. Deeply discharged cells are more susceptible to malfunctions during the next charging cycle.
• Age: Batteries have a limited lifespan. Ageing and wear can cause defects that lead to the battery swelling.
• Heat: Avoid placing the battery in direct sunlight, on a radiator or near other heat sources, as this can cause damage.

How can you tell if a battery is swollen?

A swollen battery is not always immediately obvious, but there are several clear warning signs to look out for:

• If your smartphone suddenly develops an unusual bulge or its casing becomes distorted, this could indicate that your mobile phone battery is swollen. 
• A swollen laptop battery often causes the bottom of the device to lift or bulge outwards. 
• If a power bank has a swollen battery, its casing may become severely distorted or even split open. 
• The same applies to a swollen tablet battery: the screen may lift slightly or separate from the frame. 
• Other warning signs include unusual heat, a chemical smell, hissing noises or poor battery contact during charging. 

If you notice any of these symptoms, switch off the device immediately, disconnect it from the power supply and do not use it again under any circumstances. A swollen battery is not simply a defect; it represents a serious safety risk.

Check the device

Smartphone:

• The screen is visibly lifting away from the casing.
• The back of the device is bulging outwards.
• The phone no longer lies flat on a table and rocks slightly.
• Buttons are difficult to press or become stuck.
  

Laptop:

• The touchpad responds poorly or stops working altogether.
• The underside of the laptop is bulging or appears to be under pressure.
• The casing becomes distorted, making some keys difficult to use.
• The laptop generates an unusual amount of heat.
  

Tablet:

• The screen bulges or lifts away from the frame.
• Fine cracks appear on the screen without any external impact.
• The device responds slowly to touch or the screen flickers.
  

Power bank:

• The casing appears swollen or becomes difficult to close.
• Crackling noises or unusual heat occur during charging.
• The power bank no longer sits securely on a flat surface.
  

Check the battery

If you have direct access to the battery, look out for the following signs:

• Bulges or bumps: The battery surface is no longer smooth but appears swollen or distorted.
• Leaks: Liquid is escaping from the battery or its surface feels damp.
• Discolouration: Yellowish, brownish or metallic-looking marks appear on the battery casing.
• Split or damaged areas: Cracks or split seams are visible in the battery casing.
• Gas smell: A sweet, chemical or pungent smell may indicate that gas is escaping.

How do you safely remove a swollen battery?

A swollen battery is not something to experiment with. It poses a serious safety hazard and should be removed from the device as quickly as possible, but with the utmost care. Incorrect removal can cause short circuits, sparks, smoke or even a fire. In addition, the affected device should be disposed of properly, or you should seek assistance from a qualified technician or specialist. To help you stay safe, here is a detailed step-by-step guide explaining how to proceed correctly.

Before removing a swollen battery

There are several important safety precautions you should take before starting the removal process:

• Switch off the device completely. Even if it is still working, disconnect it from the power supply and shut it down immediately. This prevents further strain on the battery.
• Disconnect all power connections. Remove all power adapters, chargers, USB cables and other connected devices. Even a small electrical voltage can be dangerous.
• Do not use sharp or metal tools. These could damage the battery cells and cause a short circuit or trigger chemical reactions.
• Do not touch the battery with bare hands, especially if it is already damaged, leaking or warm. Leaking electrolytes can irritate the skin or be harmful to your health.
• Document the condition of your device, for example by taking photographs. This may help you later with a warranty claim or repair.

How to protect yourself

When handling damaged batteries, you should take every possible precaution. After all, it is not just your device that is at risk, but your health too:

• Always wear protective gloves. They protect against possible chemical residues, sharp edges and heat.
• Wear safety goggles. These also provide protection in the event of a sudden release of gas or sparks.
• Prepare a fire-resistant container. Ideally, use a metal container with a lid or a special battery safety box. A container filled with dry sand is another option. This allows you to store the battery safely for a short period after removal.
• Do not keep water nearby! Lithium reacts strongly with water, which can cause an explosive release of heat.
• Keep away from flammable materials. Paper, textiles, plastics and wood should not be present in the work area.
• Put your mobile phone into flight mode or switch it off to avoid distractions. Your full concentration is essential.

Prepare a safe workspace

A well-prepared workspace is essential for safely removing a battery. Make sure you can work in an organised, calm environment without interruptions:

• Choose a stable, non-flammable work surface, preferably made of metal, ceramic, stone or tiles.
• Keep children and pets out of the room. Curious housemates or friends should also remain at a safe distance.
• Ensure good ventilation. If fumes or gases are released, they should not be allowed to build up in the room. Open the windows or switch on an extractor hood.
• Keep a fire extinguisher nearby. A Class D fire extinguisher designed for metal fires is ideal. Alternatively, you can use sand to smother the flames.
• Prepare all the necessary tools, such as non-magnetic screwdrivers, plastic prying tools, anti-static gloves and insulated tweezers.

How to remove a battery safely – step by step

Once you have made all the necessary preparations, you can begin removing the battery. Take your time, as patience, caution and care are essential.

1. Switch off and disconnect the device
   Make sure the device is completely switched off and disconnected from the power supply. If you are opening a smartphone, remove the SIM card or memory card if necessary.
2. Carefully open the casing
   Remove any screws and carefully prise open the casing using a plastic tool. Do not use excessive force, as some devices are secured internally with clips or adhesive.
3. Visually inspect the battery
   Examine the battery carefully: is it bulging, hot or damaged? If so, take extra care! Even small cracks or discolouration can be dangerous.
4. Carefully loosen the battery
   Many batteries are held in place with adhesive. Use a plastic spatula to slowly and evenly loosen the battery. Never bend, puncture or squeeze it!
   
5. Disconnect the connectors
   Carefully disconnect the connecting cables, such as ribbon cables or plugs, using an insulated tool. Do not pull on the cable itself; pull directly on the connector.
6. Place the battery somewhere safe
   Immediately place the battery in the prepared fire-resistant container. Close the lid and do not leave the battery unattended.
7. Clean the workspace
   Wipe the work surface with a damp, lint-free cloth without using harsh cleaning products. Afterwards, wash your hands thoroughly, even if you have worn gloves.

Get professional help if necessary

Not every battery is easy to remove, and that is perfectly understandable. If you feel that the removal process is too complicated or too risky, you should never continue experimenting on your own.

• Take your device to a specialist retailer or repair service. Many repair shops specialise in batteries and have the right tools, expertise and safety precautions.
• Repair Cafés or local community repair centres often offer free assistance from trained volunteers. These can also be a safe alternative.
• Contact customer support from your device manufacturer or ask Electropapa directly about a suitable replacement battery and professional advice.

Remember: Safety should always come first, especially when dealing with lithium-ion batteries. It is better to ask for advice once more than to take unnecessary risks!

How do you dispose of a swollen battery correctly?

A swollen or damaged battery should be taken to a household waste recycling centre or a collection point that can accept damaged batteries. Under no circumstances should it be placed in household rubbish, recycling bins, general waste or compost. Lithium-ion batteries, such as those used in smartphones, tablets, laptops and power banks, contain chemicals that can cause environmental pollution, fires or even explosions if disposed of incorrectly. They are also hazardous waste that requires special handling.

Safe transportation

Proper battery disposal begins with safe transportation. A damaged battery should never be transported loose or without protection. To prevent possible reactions, short circuits or fires, you should store it in a non-conductive, fire-resistant container. Particularly suitable options include metal containers filled with dry sand or thick-walled ceramic containers. Special battery safety bags or fire-resistant battery pouches are also recommended. In any case, it is important to ensure that the battery cannot move around, become compressed or be crushed during transportation. Cover any exposed terminals with non-conductive insulating tape to prevent accidental electrical contact.

Disposing of a swollen battery

Once you have secured the battery, take it to an authorised collection point. Across the UK, local household waste recycling centres accept used batteries, and many can also handle damaged batteries from households. However, you should contact the centre beforehand to confirm that it can safely accept a swollen or damaged lithium battery. Alternatively, you can use battery collection services provided by retailers. Under UK regulations, retailers that sell or supply at least 32 kg of portable batteries per year must provide free collection facilities for used portable batteries, without requiring a new purchase. This includes many electronics shops, mobile phone retailers, supermarkets, DIY stores and discount retailers that sell batteries. However, ordinary in-store battery collection bins may not be suitable for swollen or damaged batteries. Always speak to staff before handing over a damaged battery and follow their instructions for safe disposal.

Important information

When handing over the battery, it is essential to make it clear that it is damaged or swollen. If the collection point staff do not mention the risk themselves, make sure you inform them. Many collection facilities have special safety procedures for defective lithium batteries and must store them separately or clearly label them. Reporting the condition of the battery not only protects you but also helps keep other people handling these materials safe.

Under no circumstances should you place an unprotected, damaged battery in a standard battery recycling box or collection bin, even if it is intended for used batteries. These containers are not designed to accommodate batteries with physical damage or gas pressure building up inside them. An uncontrolled release of gas or a short circuit inside such a container could have dangerous consequences. 

Proper disposal protects not only you and your home but also the environment. If you are unsure where to find a suitable collection point nearby, contact your local council's waste management service or visit its website for information. Many local authorities also provide interactive maps or search tools to help you find battery recycling points. 

How to look after your battery properly

There is plenty you can do to prevent a battery from swelling in the first place. By following a few simple habits, you can significantly extend your battery's lifespan, whether it is the battery in your mobile phone, laptop, tablet or power bank. 

How to charge your battery correctly

A common mistake is regularly leaving a device charging overnight or keeping it permanently plugged into a power socket. Although modern batteries have protective circuits, prolonged charging can still place thermal stress on the cells over time. This risk increases particularly at higher ambient temperatures, making the battery more likely to swell. It is better to charge your battery regularly while making use of partial charging cycles. For example, you can recharge your device when the remaining battery level reaches around 20 to 30%. 

You should also avoid fully discharging your battery whenever possible. This is known as deep discharge and can permanently damage the chemical processes inside the battery. This is particularly relevant to lithium-ion batteries, which are used in most modern devices. Occasionally charging the battery to 100% is not a problem, but it should not become a regular habit, especially if the device remains connected to the power supply afterwards.

The right temperature

Temperature also plays a crucial role in battery care. Ideally, charge your device at room temperature, approximately between 15 and 25 degrees Celsius. Extreme heat, such as direct sunlight in summer or charging your device inside a car when outdoor temperatures are high, can put considerable strain on the battery's chemistry. The same applies to extreme cold: in freezing conditions, battery performance decreases and unwanted chemical reactions may occur. For this reason, charging should take place within a moderate temperature range whenever possible.

Replacing your battery with an Electropapa battery

Once you have safely removed the faulty or swollen battery, the next important question is: where can you find a suitable and, above all, safe replacement? This is where Electropapa comes in – your reliable partner for high-quality replacement batteries. Instead of disposing of your device prematurely or buying a new one, you can easily restore it to full working order with a compatible battery from Electropapa .

Our range includes a wide selection of replacement batteries for various devices, including smartphones, laptops, tablets, cameras, vacuum cleaners, power banks and much more. You can rely on every battery meeting current European safety standards and delivering dependable performance, even with everyday use. We also place great importance on the durability and consistently high performance of our products.

At Electropapa, you not only get quality products, but also excellent value for money. We stand for fair prices, transparent information, and customer service that provides you with expert assistance if you have any questions or concerns. And best of all, by replacing your battery, you are actively contributing to the conservation of resources. After all, a device that can be reused with a new battery generates significantly less electronic waste and helps protect the environment.