The battery empties within an hour
Why does my laptop battery drain so fast now?
Written by The CommonFixes team · fact checked by CommonFixes review desk
Last updated
Short answer
Batteries wear out with every charge cycle, but background programs and a bright screen make a healthy battery look dead. The quickest thing to try first: check the real health of the battery — On Windows open Terminal as administrator and run powercfg /batteryreport. Open the file it saves and compare Full Charge Capacity with Design Capacity. Below sixty percent means the battery is worn out. On a Mac look under System Settings, Battery, Battery Health. Most people are done in about 15 minutes.
Full walkthrough below: 5 steps for Windows and Mac, rated easy.
Sounds like this
- •Charge falls quickly
- •Percentage jumps down suddenly
- •Shuts off before reaching zero
Why it happens
Batteries wear out with every charge cycle, but background programs and a bright screen make a healthy battery look dead.
Work through these in order
0% done- 1
Check the real health of the battery
On Windows open Terminal as administrator and run powercfg /batteryreport. Open the file it saves and compare Full Charge Capacity with Design Capacity. Below sixty percent means the battery is worn out. On a Mac look under System Settings, Battery, Battery Health.
- 2
Lower the screen brightness
The screen is the biggest single drain. Dropping brightness to around fifty percent often adds an hour of use.
- 3
Find the background drains
Open Settings, System, Power and battery, then Battery usage. It lists exactly which apps drained the most in the last day.
- 4
Turn on the battery saver
Switch on Energy saver and set it to start automatically at thirty percent.
- 5
Stop charging to one hundred percent all the time
Many laptops offer a battery care setting that stops charging at eighty percent. Leaving a battery plugged in at full charge and warm is what wears it out fastest.
If none of that worked
A swollen battery pushing the case apart or the touchpad upward is a safety risk. Stop using the laptop and have it replaced immediately.
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Who wrote this and how we checked it
The CommonFixes team
Writer and researcher
We are a small group of people who spend our days repairing laptops and desktops for family, friends and small offices. Every guide here starts with a problem someone actually brought to us, and we only write down the steps that put the machine right.
- Everyday repairs
- Windows and Mac
- Plain language
CommonFixes review desk
Technical editor
Before a guide goes live, a second person walks through it on a real machine and checks each instruction against the maker's own support pages. Anything we cannot confirm is removed rather than guessed at.
- Fact checking
- Safety warnings
- Source links
This guide was last updated on 10 August 2026. If a step no longer matches what you see on screen, tell us on the contact page and we will test it again.
A gentle reminder: back up anything you cannot afford to lose before major repairs. If a step ever feels risky, stop and ask a technician. There is no shame in that.