Laptop battery draining fast? What to check before buying a new one

If your laptop used to last a full afternoon and now barely survives a meeting, the battery may well be worn out. But before you spend money on a replacement, it's worth ruling out the causes that cost nothing to fix. Plenty of "dead batteries" turn out to be a hungry program or a setting.

Step 1: See what's using the power

On Windows 11, open Settings → System → Power & battery → Battery usage. It shows which apps used the most battery over the last day or week. If one app is far ahead of the rest, that's your culprit. Common offenders are web browsers with dozens of tabs open, video calls, cloud backup apps syncing in the background and programs that should have been closed.

Step 2: Turn down the obvious drains

• Screen brightness. The screen is usually the biggest power user. Dropping brightness by a quarter makes a noticeable difference.
• Battery saver. In the same Power & battery settings you can turn it on automatically at a set percentage.
• Startup programs. Press Ctrl + Shift + Esc, open the Startup apps tab and switch off things you don't need running every time.
• Bluetooth, and WiFi when you don't need it. Small, but they add up.

Step 3: Check the battery's health

Windows can produce a battery report that shows how much capacity the battery has lost.

1. Right-click the Start button and choose Terminal (or Windows PowerShell).
2. Type `powercfg /batteryreport` and press Enter.
3. It saves a file and shows you where. Open that file in your browser.
4. Compare Design capacity with Full charge capacity. If the full charge number is well under about 60% of the design number, the battery has worn out.

Batteries wear with every charge cycle, so a laptop that's three to five years old and used daily has very likely lost a fair chunk of its capacity.

Step 4: Decide between replacing the battery and the laptop

If the battery report shows a worn battery and the laptop is otherwise running well, a new battery is often a cheap way to add years of life. If the laptop is also slow, struggling with updates or physically worn, the money may be better put toward a replacement. Our guide Is your old computer worth repairing? walks through that decision.

Warning signs: stop using it

Call a technician straight away and stop charging the laptop if you notice:

• The case, keyboard or trackpad is swelling or bulging, or the lid won't close flat.
• The laptop gets unusually hot while it's just sitting there.
• A burning or chemical smell.

A swollen battery is a fire risk, not just a nuisance.

Need a hand?

We can check the battery, replace it if it's worth it and tidy up what's draining power in the background. See our laptop repair service, call 1800 851 816 or book a visit.

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