Laptop Shutting Down at 20-30% Battery
4.5
The laptop dies suddenly even though the battery indicator says it has charge left.
Symptoms
- Sudden shutdown
- Inaccurate percentage
- Fast drain
Possible Causes
- Unbalanced battery cells
- Calibration error
- Old battery
Step-by-Step Fix
1
Calibrate the Battery
Charge to 100%, leave it for 2 hours, drain to 0%, then charge back to 100%.
2
Check Battery Report
In Windows, run "powercfg /batteryreport" to see the "Design Capacity" vs "Full Charge Capacity".
3
Update BIOS
Manufacturers often release updates to improve battery management accuracy.
When to See a Technician
If your "Full Charge Capacity" is less than 50% of "Design Capacity", the battery is worn out.
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