Smartphone "Battery Percentage" Jumps
4.5
The battery drops from 40% to 10% in a minute, or increases suddenly when plugged in.
Symptoms
- Inaccurate percentage
- Sudden drops
- Fast charging/draining
Possible Causes
- Calibration error
- Old battery
- Software glitch
Step-by-Step Fix
1
Calibrate the Battery
Drain to 0% until it shuts off, then charge to 100% without interruption.
2
Check Battery Health
Settings > Battery > Battery Health (on iPhone) or use an app like AccuBattery.
3
Update Software
Ensure the OS has the latest battery management algorithms.
When to See a Technician
If the battery is more than 2-3 years old, it likely has "voltage sag" which confuses the sensor.
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