An important safety guide: why a swollen lithium-ion battery is a chemical ‘bomb’ in your home and how to dispose of it correctly without causing a fire hazard.
What is a swollen battery and why is it deadly dangerous
In tech enthusiasts’ jargon, they are often referred to as “sharp pillows,” but in reality, a swollen lithium-ion (Li-Ion) battery is one of the most dangerous phenomena in consumer electronics. It is not just a cosmetic defect or inconvenience – it is an unstable chemical element that poses a real fire threat.
Unfortunately, many users, upon noticing a bulging phone screen or a deformed laptop casing, ignore the problem or, worse, throw the device into general waste. In this article, we will discuss the causes of battery swelling, the chemical processes involved, and the only safe disposal method in Lithuania.
Why do batteries turn into gas balloons?
The operation of lithium-ion batteries is based on the movement of ions between electrodes. However, as they age, experience physical shock, overheat, or due to manufacturing defects, the electrolyte begins to decompose. This process, known as electrolyte decomposition, releases flammable gases: carbon dioxide, carbon monoxide, and hydrogen.
Since the battery cell is hermetically sealed, the accumulated gases have nowhere to escape and cause the outer casing to swell. This acts as a sort of fuse: the casing expands, trapping the gases inside and preventing them from reacting with ambient oxygen, which would cause an instant ignition.
Why the trash bin is the worst place
It is strictly prohibited to throw a swollen battery into a general waste container or even into standard battery collection boxes in stores.
The Danger of Garbage Truck Compactors
Waste management machines use powerful compactors to compress garbage. If such a compactor damages the casing of a swollen battery, thermal runaway will occur – an uncontrolled chemical reaction that causes an intense, hard-to-extinguish fire. This is one of the most common causes of fires in waste management centers.
Four Steps to Safety
If you smell a chemical odor, see a bulging screen, or notice a deformed casing, act immediately.
Step 1: Stop
Immediately disconnect the charger and turn off the device. Charging generates heat, which only encourages further gas release and increases the risk of explosion. Important: do not press the battery back into the casing – mechanical pressure can puncture the cell.
Step 2: Careful Removal (with Conditions)
If the device is old and the battery is easily removable, you can do so, but only with safety precautions:
- Work outdoors or in a well-ventilated area.
- Wear protective goggles.
- Important: If the battery is glued in (most modern phones), do not attempt to forcefully pull it out. This could damage the casing. In this case, take the entire device to a specialist.
Step 3: Isolation
The removed (or still in the device) battery must be stored safely until disposal.
- Cover the exposed contacts with insulating tape to prevent short-circuiting.
- Place the battery in a non-flammable container, such as a metal bucket filled with sand. The sand will act as an insulator in case of fire.
- Keep it in a cool, dry place, away from flammable materials.
Step 4: Safe Disposal in Lithuania
Swollen batteries do not follow standard rules:
- Avoid store collection boxes: Collection boxes in shopping centers are intended for healthy batteries. A “swollen” battery thrown in can be compressed with other batteries and cause a fire in a public place.
- Large waste disposal sites (KRATC, VAATC, etc.): This is the safest route. These sites have separate containers for hazardous waste. Be sure to inform the staff about the battery’s condition.
- Electronics services: Many services accept such batteries as they have direct contracts with hazardous waste handlers.
Need help with your device?
If your phone, computer, or tablet is not working properly, bring it to Fiksas. We perform fast diagnostics and often complete repairs within 1–3 hours.