Battery calibration incorrect
4.5
The device shuts down at 20% or stays at 100% for hours before dropping rapidly.
Symptoms
- Sudden shutdown
- Inaccurate %
- Random jumps in level
Possible Causes
- Software desync
- Old battery
- Deep discharge
Step-by-Step Fix
1
Full Cycle Reset
Charge to 100%, discharge until it dies, then charge back to 100% uninterrupted.
2
Update BIOS/Firmware
Manufacturers often release fixes for battery reporting bugs.
3
Check Battery Health
Use "powercfg /batteryreport" to see the actual capacity vs design capacity.
When to See a Technician
Calibration doesn't fix a dead battery; it only makes the reporting more accurate.
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