StarLabs Glossary / Business Laptop Repair Terms
Swollen Laptop Battery
A lithium battery that has started to puff up inside the laptop. It is a safety problem first and a repair second.
A swollen laptop battery is a lithium-ion or lithium-polymer battery whose cells have expanded because gas has built up inside them. It is caused by age, heat, physical damage or a charging fault. A swollen battery can push the case apart, damage other parts and, in the worst case, catch fire. It should be taken out of use straight away.
How it happens
Laptop batteries store energy in thin layers sealed in a soft pouch. As a battery ages, chemical reactions inside can produce gas. Heat speeds this up, so laptops left charging all day in a warm room, or used on a bed or sofa, are more at risk. A drop or a puncture can damage the layers too.
Because the pouch is soft, the gas makes it swell. The battery sits under the keyboard and trackpad, so that is usually where you see it first.
Warning signs
- The trackpad feels stiff, raised or stops clicking
- The laptop rocks on a flat desk
- A gap opens between the case panels, or the screen will not close fully
- The keyboard bulges in the middle
- The laptop gets unusually hot, or there is a sweet or chemical smell
- Battery life drops sharply and the laptop shuts down without warning
Built-in tools can show battery wear before it becomes a hazard. On a Mac, go to System Settings, then Battery, and check Battery Health. “Service Recommended” means it holds less charge or is not working normally. On Windows, IT can run powercfg /batteryreport to produce a report of the battery’s capacity over its life. These tools show wear, not swelling, so always check the physical signs too.
What to do right now
| Do | Do not |
|---|---|
| Save work, shut down and unplug the charger | Keep charging it to “finish the day” |
| Place it on a hard, non-flammable surface away from paper and fabric | Leave it in a bag, drawer or under a pile of files |
| Keep it in a cool, ventilated spot until it is collected | Press on the bulge or try to flatten the case |
| Carry it by hand to the repairer, in a sturdy box | Puncture, bend or remove the battery yourself |
| Tell any courier it has a damaged lithium battery | Take it on a flight |
If you see smoke, sparks or hear hissing, move people away and call 995.
What it means for your business
One swollen battery in an office full of paper is a real fire risk. Tell staff to report a raised trackpad or gapping case at once, not at the next IT visit. Check battery health during routine maintenance, especially on laptops more than a few years old or ones that sit on chargers all day. Swollen batteries should go to a proper e-waste or battery recycling point, never into normal office bins.
Common questions
Can I keep using a laptop with a slightly swollen battery?
No. Swelling does not reverse and can get worse quickly. Stop using and charging it, back up what you can from another device or the cloud, and arrange a battery replacement.
Can I run the laptop on the charger without the battery?
Do not try to remove a swollen battery yourself. Pulling or prying it can puncture the cells. Let a technician remove it safely.
Is the data at risk?
Usually not directly. But a swollen battery can crack the trackpad, screen or board if left too long. Back up early, and have the BitLocker key or FileVault details ready in case further repair is needed.
Spotted a raised trackpad on a company laptop?
Stop charging it and get the battery replaced safely.
Sources: Apple Support: Battery Service Recommended on Mac laptops, Microsoft Learn: powercfg command-line options
Reviewed by the StarLabs technical team · Last checked 18 October 2026
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