Overview

Most laptops should last 6-10 hours on battery. If yours dies in 2-3 hours, background apps, screen brightness, or battery degradation are likely culprits.

Step 1: Diagnose the Problem

Find what's draining your battery.

1

Check Battery Health

Windows: Open Command Prompt as admin, type: powercfg /batteryreport
Open the generated HTML report from your user folder
Check 'Design Capacity' vs 'Full Charge Capacity'
If full charge is less than 50% of design, battery needs replacing
Mac: Hold Option and click the battery icon in menu bar
Check battery condition: Normal, Replace Soon, Replace Now, Service

2

Identify Power-Hungry Apps

Windows: Settings → System → Power & battery → Battery usage
See which apps use the most battery over the last 24 hours
Mac: Click battery icon in menu bar, see 'Using Significant Energy'
Activity Monitor → Energy tab shows app energy impact
Close or uninstall apps that use excessive power

3

Check Background Activity

Windows: Settings → Privacy → Background apps
Disable background activity for apps that don't need it
Mac: System Settings → General → Login Items
Remove unnecessary startup items
Check for apps running in the menu bar/system tray

Step 2: Optimise Settings

Quick changes that significantly extend battery life.

1

Display Settings

Reduce screen brightness to 40-60% when on battery
Enable auto-brightness if available
Reduce screen timeout to 2-3 minutes
Use dark mode to save power on OLED screens
Lower display resolution if your laptop supports it

2

Power Plan Settings

Windows: Settings → System → Power & battery
Set power mode to 'Best power efficiency' on battery
Set screen off after 3 minutes, sleep after 5 minutes
Mac: System Settings → Battery
Enable 'Low Power Mode' on battery
Set display to turn off after 2 minutes

3

Connectivity Settings

Turn off Wi-Fi and Bluetooth when not needed
Disable location services when not required
Turn off keyboard backlighting or reduce brightness
Disconnect USB devices that draw power
Disable auto-sync for cloud services when on battery

Pro Tip:

Airplane mode can extend battery by 10-15% when you don't need internet access.

Step 3: Hardware Considerations

When software fixes aren't enough.

1

Battery Replacement

If battery health is below 50%, replacement is recommended
Laptop manufacturer batteries cost £40-100
Many laptops allow user-replaceable batteries (check manual)
For sealed laptops, visit a repair shop
After replacement, calibrate by fully charging then fully discharging once
New batteries typically last 2-4 years with normal use

Overview

Step 1: Diagnose the Problem

Check Battery Health

Identify Power-Hungry Apps

Check Background Activity

Step 2: Optimise Settings

Display Settings

Power Plan Settings

Connectivity Settings

Step 3: Hardware Considerations

Battery Replacement

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