What Causes a Battery to Swell and How You Can Prevent It

Battery swelling is one of those unexpected problems that can often catch us off guard. If left unaddressed, it can inflict serious internal damage to your device and is a safety hazard. But what causes this concerning issue, and what steps can you take to prevent it?

Overcharging
Keeping your device plugged in after full charge or frequently charging to 100% can cause battery swelling by disrupting chemical processes and releasing gases, even though lithium-ion batteries stop drawing power when full.

To avoid overcharging, enable “smart charging” to limit charging beyond 80%, or unplug the device at 80-90% if the feature isn’t available. Avoid overnight charging or keeping the battery fully charged for long periods.

Deep Discharging
Deep discharging can damage batteries by causing copper plating on electrodes, reducing capacity, increasing resistance, and generating heat, which may lead to swelling over time.

To prevent this, keep the charge above 20% and recharge when needed.
Use power-saving mode to extend battery life and avoid leaving devices in sleep mode for long periods to prevent deep discharge.

High Temperatures and Moisture
High temperatures accelerate battery degradation and swelling by speeding up chemical reactions. High moisture levels can cause condensation, increasing the risk of a short circuit.

To protect your battery, Avoid extreme temperatures and high humidity to protect your battery. Keep it out of direct sunlight,
charge in a stable environment, use a waterproof case near water, and place silica gel packs in your bag to reduce moisture.

Physical Damage
Physical damage, like dropping or applying excessive pressure to the battery,
can rupture its casing, exposing it to air or moisture. This disrupts chemical reactions, releasing gases or acids, and may lead to swelling or fires.

To prevent such issues, handle your battery and device with care. Avoid placing your laptop in overfilled bags where pressure can build up. Also, keep it away from areas prone to accidental drops, and always use a well-cushioned suitcase when traveling to protect it from unexpected impacts during unintentional falls.

Using Non-Original Chargers
Using low-quality or counterfeit chargers can cause battery swelling by supplying inconsistent or excessive voltage, putting stress on the battery’s internal chemistry and damaging cells over time.

To avoid battery swelling, use original chargers and cables from the manufacturer, or certified third-party ones that meet safety standards. Regularly check for wear or damage, and replace them as needed.

Battery Aging
Repeated charge and discharge cycles cause natural battery degradation, reducing capacity and efficiency. As internal components
wear down, resistance increases, accelerating gas production, which can lead to overheating and swelling.

Although battery aging is inevitable, you can slow its deterioration by avoiding overcharging, frequent full discharges, and keeping the charge between 20-80%. Use original chargers and protect the battery from heat, moisture, and physical damage.

Manufacturing Defects
Though rare, a built-in or replacement battery can swell due to internal manufacturing defects like improper sealing, faulty chemical mixtures, or defective components. These issues can disrupt chemical reactions, causing overheating, short circuits, and swelling.

To prevent battery swelling, purchase batteries from reputable brands or authorized retailers. Avoid cheap, unbranded replacements
that may not meet safety standards. If your new battery charges slowly, drains quickly, or shows other warning signs,
replace it to avoid swelling and further damage.

Faulty Battery Management System
The battery management system (BMS) regulates charging, discharging,
and temperature, monitoring variables like voltage and current to ensure safe operation. A malfunctioning BMS can lead to overcharging, undercharging, or excessive heat, stressing the battery and causing swelling.

To prevent damage or swelling from a faulty BMS, watch for signs like error messages, inaccurate charge estimates, overheating, charging problems, or failure to stop charging at the set threshold. If these occur, have a technician check for BMS issues and calibrate the battery to ensure proper system function.

Poor Repair or Maintenance
Improper maintenance or repair, such as using the wrong tools, damaging the protective casing, exposing the battery to moisture or high temperatures, over-tightening screws, or improper installation, can harm the battery and lead to swelling over time.

To avoid damage, always have your battery repaired or replaced by the manufacturer to protect it and maintain your warranty.
If that’s not an option, seek help from a professional at a trusted service center. When replacing the battery yourself,
follow detailed guides and use the proper tools.

Now that you know the factors that can cause your device’s battery to swell, you must take proactive measures to avoid damage.
By following the tips above, you can keep your battery in good condition for a long time. Regularly check your laptop battery;
if it begins to swell due to aging, replace it to avoid any potential damage to your device.

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