How to Extend the Battery Life of an Aging Laptop
Laptop batteries degrade with age — that’s chemistry, not a fixable problem. But most laptops that “barely last an hour” are losing far more charge to software and settings than to actual battery wear. Here’s what to check before assuming you need a replacement.
1. Check what’s actually draining it
Windows: Settings > System > Power & Battery > Battery usage shows which apps have used the most charge recently. Mac: Activity Monitor’s Energy tab does the same. A single runaway app or browser tab can quietly account for a large share of battery drain.
2. Lower screen brightness and turn off keyboard backlighting
The display is typically the single largest power draw on a laptop. Dropping brightness from 100% to 50% can meaningfully extend runtime, and it’s the fastest, free fix available.
3. Use your operating system’s power-saving mode
Both Windows (Battery Saver) and macOS (Low Power Mode) throttle background activity and reduce performance slightly in exchange for real battery gains — often 20-30% more runtime. Worth using by default on an aging battery, not just when you’re already low.
4. Close browser tabs you’re not using
Each open tab, especially anything with video, animation, or auto-refreshing content, keeps the CPU active in the background. A browser with 20 tabs open can measurably shorten battery life compared to the same browser with 3.
When it really is the battery
If none of the above helps and the laptop is more than 3-4 years old, genuine battery degradation is the likely cause — lithium-ion batteries lose capacity over hundreds of charge cycles regardless of how carefully they’re used. Many laptops can have the battery professionally replaced for meaningfully less than a new machine, worth a call to a local repair shop or the manufacturer before buying new.
