A trackpad that clicks on its own, a keyboard that feels raised, or a bottom panel that no longer sits flat — these are the classic signs of a swollen laptop battery. If you noticed them right after installing a Windows 11 update, it’s natural to blame the update.

The truth is simpler and more urgent: a Windows update cannot swell a battery. Swelling is a physical failure inside the lithium-ion cells, and it is a safety issue that needs to be handled before anything else. Software troubleshooting comes second — and only if the battery is confirmed safe.

Why this happens

  • Gas buildup inside aging cells: As lithium-ion batteries age, internal chemical reactions produce gas. Over hundreds of charge cycles, this pressure can bulge the pouch or cell casing outward.
  • Heat damage: Laptops that run hot for long periods — blocked vents, heavy gaming, charging on soft surfaces — accelerate cell degradation and swelling.
  • A defective cell from the factory: Occasionally a cell ships with a manufacturing flaw. It can swell months or even years later, sometimes seeming to coincide with an unrelated software update.
  • Overcharging or faulty charge circuitry: If the charging circuit or a third-party charger delivers incorrect voltage, cells can overheat and swell. This is a hardware problem, not something a Windows update controls.
  • Physical damage: A drop or impact can damage internal cell separators, leading to slow gas buildup and swelling weeks later.
  • Why the update timing is a coincidence: Updates reboot the system, change power management drivers, and sometimes recalibrate battery reporting. None of these affect the chemistry inside a sealed battery cell.

How to fix it

Work through these in order. Safety steps come first — do not skip ahead to software fixes while the battery is swollen.

Fix 1: Stop using and unplug the laptop immediately

A swollen battery can rupture, leak, or catch fire. Treat this as the priority.

  1. Save your work and shut the laptop down through Start > Power > Shut down — do not just close the lid and put it to sleep.
  2. Unplug the charger from the wall and the laptop.
  3. Move the laptop to a hard, non-flammable surface away from paper, curtains, and other electronics.
  4. Do not plug it back in or try to “drain” the battery — charging a swollen battery increases the risk.

Fix 2: Do not try to fix the swelling yourself

Swelling cannot be reversed by software, calibration, or any settings change.

  1. Never press, squeeze, or puncture the swollen area to “let the gas out” — this can cause a fire or chemical burn.
  2. Do not remove a swollen internal battery yourself unless the manufacturer specifically documents it as user-replaceable and the battery is only mildly deformed. Most modern laptop batteries are glued in.
  3. If the battery is removable (older models with a latch), you may slide it out while the laptop is off and unplugged, then store it safely — but only if it comes out without force.

Fix 3: Check whether your model has a battery recall or advisory

Manufacturers occasionally issue recalls for batteries prone to swelling.

  1. Find your exact model and serial number on the sticker underneath the laptop or in Settings > System > About.
  2. Visit the manufacturer’s support page — for example, Dell support — and search for your model plus “battery recall.”
  3. Also check your email for any recall notices you may have missed.
  4. If a recall applies, follow the manufacturer’s replacement process — it is usually free, including shipping.

Fix 4: Confirm the diagnosis with a battery report

This doesn’t fix swelling, but it gives the service center useful history and confirms the battery was degrading.

  1. Open Terminal (Admin) or Command Prompt (Admin) and run powercfg /batteryreport.
  2. Open the generated report from C:\Windows\System32\battery-report.html in your browser.
  3. Look at the Battery capacity history section — a steep drop in full charge capacity around the time swelling appeared confirms cell failure.
  4. Screenshot or save the report to show the technician. For help reading it, see our guide on how to check battery health .

Fix 5: Arrange a professional battery replacement

This is the actual fix. A swollen battery must be replaced, not repaired.

  1. Contact the laptop manufacturer’s authorized service center or a reputable local repair shop. Describe the swelling clearly.
  2. Ask for a genuine replacement battery — cheap third-party cells are a common cause of repeat swelling.
  3. Back up your files before handing the laptop over, since the technician may need to open the chassis.
  4. If the laptop is under warranty, the replacement is usually covered — check your warranty status on the manufacturer’s site first.

Fix 6: Rule out charger and firmware issues for the new battery

Once the swollen battery is replaced, make sure the conditions that stressed it don’t continue.

  1. Use only the original charger or a manufacturer-approved replacement with the correct wattage.
  2. Update your BIOS/UEFI firmware from the manufacturer’s support site, since firmware controls charging behavior.
  3. In Windows 11, go to Settings > System > Power & battery and avoid leaving the laptop plugged in at 100% for weeks — use any built-in battery charge limiter your manufacturer provides.
  4. Keep vents clear and avoid charging the laptop on beds or couches.

Fix 7: Verify the update didn’t just change battery reporting

In rare cases, what looks like a battery problem after an update is actually miscalibrated reporting on an already-weak battery.

  1. After the battery is replaced and the laptop is confirmed safe, run powercfg /batteryreport again to verify the new battery’s design capacity matches its full charge capacity.
  2. If Windows shows odd percentages on the new battery, update the battery driver in Device Manager > Batteries — right-click Microsoft ACPI-Compliant Control Method Battery and choose Update driver.
  3. If charging behaves strangely after the 24H2 update specifically, see our walkthrough for a laptop battery not charging after the Windows 11 24H2 update .

Closing

A swollen battery after a Windows 11 update is frightening, but the update is a bystander — the battery itself has failed and needs professional replacement. Power down, unplug, don’t puncture it, and get it to a service center. Once a genuine new battery is in, a quick driver and firmware check makes sure the next one lives a long, flat life.

Frequently asked questions

Can a Windows 11 update make my laptop battery swell?
No. Battery swelling is caused by gas buildup inside lithium-ion cells from age, heat, overcharging, or a manufacturing defect. A Windows update changes software and firmware only — it cannot inflate a battery. If swelling appeared around the time of an update, the timing is a coincidence, and the battery was likely already failing.
Is it safe to keep using a laptop with a swollen battery?
No. A swollen battery is a fire and chemical hazard. Stop using the laptop, unplug the charger, and power it off. Do not charge it, do not press on the swollen area, and do not puncture it. Arrange a replacement through the manufacturer or an authorized service center as soon as possible.
How do I dispose of a swollen laptop battery?
Never put it in household trash or recycling. Place the battery or laptop in a fire-safe container away from flammable items and take it to a battery recycling point or an authorized service center. Many electronics retailers and municipal waste sites accept damaged lithium batteries at no charge.
Can a battery report tell me why my battery swelled?
A powercfg /batteryreport shows capacity history, which may show a sharp capacity drop around the time swelling started. That confirms the battery was degrading, but it cannot diagnose swelling itself. Swelling is a physical failure — the report is useful context for the service center, not a fix.