Stop
A swollen lithium-ion battery can leak, catch fire, or rupture; treat it as a safety hazard, not a repair project.
Symptoms
- Trackpad or keyboard deck feels raised, bulging, or won't sit flat
- Bottom case is warped or won't close fully
- Laptop feels unusually thick in the battery area
- Case seams have separated or cracked open
Likely causes
- CommonBattery cell degradation releasing gas internallyThis happens naturally as lithium-ion batteries age, especially past 3–5 years.
- CommonRepeated exposure to heat (charging on soft surfaces, hot cars, direct sun)Heat accelerates the chemical breakdown that causes swelling.
- PossibleOvercharging or a faulty charging circuitRare on modern laptops with protection circuits, but not impossible.
- PossiblePhysical damage to the battery from a drop or impactA cracked cell can swell rapidly.
What to do
- Stop using the laptop immediately and unplug the charger.
- Move the laptop to a non-flammable surface away from anything combustible, and avoid enclosed spaces like backpacks.
- Do not puncture, press on, bend, or try to remove the battery yourself.
- Do not charge it again, and do not try to keep using it 'just a little longer.'
- Power it off completely if it's still on, and do not attempt to force the case shut.
- Contact a certified repair shop or the manufacturer for safe battery removal and disposal, and mention the swelling explicitly.
Tools and parts
- None — do not attempt DIY work on a swollen battery
Replacement battery (professional install only)Search: “[laptop model] replacement battery certified repair”
When to call a pro
Take it to a certified repair shop or the manufacturer immediately for safe removal; if you see smoke, smell burning, or the case is actively expanding, move it outside and away from people before calling for help.
Safety
Stop
A swollen lithium-ion battery can leak, catch fire, or rupture; treat it as a safety hazard, not a repair project.