An iPhone battery should be replaced primarily when its maximum capacity falls below 80%. This indicates that the battery's ability to hold a charge is significantly degraded, which can lead to quick battery drainage, unexpected shutdowns, slow device performance, and charging issues. Apple recommends checking battery health via Settings > Battery > Battery Health & Charging. Additional signs for replacement include rapid battery drain, slow charging, sudden shutdowns especially below 20-30%, and noticeable device slowdown. Also, batteries generally reduce capacity after roughly 500 full charge cycles. Replacing the battery at the right time can restore performance and extend the iPhone's lifespan.
Key Replacement Indicators
- Battery health below 80% capacity.
- Battery drains quickly even with light use.
- iPhone shuts down unexpectedly at higher battery percentages.
- Device performance slows down due to battery-related throttling.
- Longer charging times or inability to hold charge.
- Physical signs like battery swelling affecting the screen.
How to Check Battery Health on iPhone
- Open Settings.
- Tap on Battery.
- Select Battery Health & Charging.
- View the Maximum Capacity percentage.
- Look for messages recommending battery replacement.
Additional Notes
- Average battery lifespan is about 2 to 3 years or around 500 full charge cycles.
- Replacing the battery can be done via Apple or authorized service providers.
- Performance issues often improve after battery replacement.
This guidance comes from Apple and technology experts emphasizing battery capacity thresholds and practical usage signs for deciding when to replace the iPhone battery.
