Phone "Battery" Percentage Jumps Around
4.5
Your phone says 40%, then suddenly drops to 10%, or jumps up when you plug it in.
Symptoms
- Unstable percentage
- Sudden shutdown
- Fast drain
Possible Causes
- Calibration error
- Failing battery cell
- Cold weather
Step-by-Step Fix
1
Calibrate the Battery
Drain to 0% until it turns off, then charge to 100% without interruption.
2
Check Battery Health
Settings > Battery > Battery Health. If below 80%, it needs replacement.
3
Avoid Extreme Cold
Batteries struggle to report voltage correctly in freezing temperatures.
When to See a Technician
If the percentage jumps by more than 10% instantly, a physical cell inside the battery is likely failing.
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