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PC Repair

5 Signs Your Laptop Battery Needs Replacing

📅 24 June 2026 ⏱ 4 min read 🔧 PC Repair

Your laptop used to last all day on a single charge. Now you're hunting for a plug socket after an hour. Sound familiar? A failing battery is one of the most common laptop problems we see — and one of the most straightforward to fix once you know what you're dealing with.

Here are five clear signs that your laptop battery is on its way out, and what you should do about each one.

1. The Battery Drains Much Faster Than It Used To

Every rechargeable battery has a finite number of charge cycles — typically 300–500 for most laptops. After that, it simply holds less energy. If a battery that once lasted five or six hours now struggles to reach two, that's not a software glitch or a power setting issue. That's a worn-out cell telling you its time is up.

Quick check: On Windows, open Command Prompt and type powercfg /batteryreport — it generates a full battery health report. On a Mac, hold Option and click the battery icon in the menu bar; if it says Service Recommended, trust it.

Laptop plugged in and charging on a desk

2. The Laptop Shuts Down Without Warning

You're mid-sentence in a document and the screen goes black — battery icon still showing 30%. This is a classic symptom of a battery that can no longer accurately report its own charge level. The cells are so degraded that what looks like 30% is actually nothing at all. It's unpredictable and genuinely frustrating, but more importantly, sudden power cuts can corrupt files and, over time, harm your hard drive.

If this is happening to you more than once a week, don't put it off. Sudden shutdowns cause real damage beyond the inconvenience.

3. The Battery Only Works When Plugged In

Some laptops reach a point where they function perfectly as a desktop machine — as long as they stay plugged in — but the moment you unplug, they die instantly. At this stage the battery has effectively zero usable capacity. It's not a power-management setting or a driver problem; the battery is dead in all but name. You now own a very expensive desktop computer with a very short extension lead.

4. The Laptop Gets Unusually Hot Around the Battery Area

All laptops generate some heat — that's normal. But if the underside or the palm-rest area is noticeably hot even during light tasks like browsing or writing, a degraded battery could be the culprit. Failing cells work harder to deliver the same output, generating excess heat in the process. Consistent overheating stresses other components too — the motherboard, the RAM, the storage drive — so it's worth addressing promptly.

Hand feeling heat from a laptop keyboard

If your laptop is also running noisy fans constantly, it may be worth reading our post on other warning signs your laptop needs a repair — overheating often points to more than one issue at once.

5. The Battery Case Is Visibly Swollen or Bulging

This one is urgent. If your laptop lid no longer sits flat, the trackpad feels raised, or you can see the casing pushing outward, stop using it immediately. A swollen battery is a lithium cell that has started to off-gas — it can, in rare cases, lead to fire. Don't puncture it, don't throw it in the bin, and don't leave it charging overnight.

Bring it to a repair shop as soon as possible. This is not a scare tactic — it's genuinely one situation where acting quickly matters. We handle swollen battery removals and safe disposal regularly here on the Costa Blanca.

Swollen laptop battery removed from device

How Long Should a Laptop Battery Last?

Realistically, two to four years of regular use, or roughly 300–500 full charge cycles — whichever comes first. You can extend that life by not leaving the laptop plugged in at 100% permanently, keeping it cool, and avoiding letting it drain to 0% repeatedly. But at some point, all batteries go, and replacement is the only real fix.

DIY or Take It In?

Some laptops — older ThinkPads and certain Dell models — have easily removable batteries you can swap yourself with a compatible part from a reputable supplier. Most modern slim laptops, and virtually all MacBooks, have batteries that are glued or deeply integrated. Getting those out without the right tools risks damaging the screen, the trackpad cables, or the logic board. If there's any doubt, it's cheaper in the long run to have it done properly.

We replace laptop batteries for most makes and models at our workshop in Pinar de Campoverde, Pilar de la Horadada. Turnaround is usually same-day or next-day. If you're not sure whether your battery is the problem, bring the laptop in — a quick check costs nothing.

And if your machine is showing other odd behaviour alongside a dodgy battery, it may be worth a broader look. Our guide to 5 warning signs your laptop needs a repair covers what else to watch for.

FAQ

How do I know if my laptop battery needs replacing?

The clearest signs are dramatically reduced run time, unexpected shutdowns while charge is still showing, the laptop only working when plugged in, excessive heat around the battery, or a visibly swollen case. On Windows, run 'powercfg /batteryreport' for a detailed health report. On a Mac, Option-click the battery icon in the menu bar.

How much does a laptop battery replacement cost?

It varies by make and model, but for most common laptops it's an affordable repair. The bigger cost risk is putting it off — sudden shutdowns can corrupt data and damage other components. Contact us for a quote specific to your laptop.

Can I replace my laptop battery myself?

On some older models with removable batteries, yes — as long as you use a quality compatible part. On most modern slim laptops and all MacBooks, the battery is glued in place and requires proper tools to remove safely. Getting it wrong can damage the screen or logic board, which is a far more expensive repair.

Is a swollen laptop battery dangerous?

Yes, it can be. A swollen lithium battery is off-gassing and poses a small but real fire risk. Stop using the laptop, do not charge it overnight, and do not throw the battery in normal waste. Bring it to a repair shop for safe removal and disposal as soon as possible.

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