When Should You Replace Your Phone Battery? 5 Warning Signs

5 Signs Your Battery Needs Replacement 1. **Rapid Drain Below 30%:** Your battery drops rapidly from 30% to 5% within minutes. 2. **Battery Expansion or Bulging:** Screen lifted from the frame indicates battery swelling — replace immediately to avoid fire risks. 3. **Overheating During Charging:** Excessive heat generated even during slow charging. 4. **Maximum Capacity Below 80%:** iPhone battery health report dropping below 80%. 5. **Random Shutdowns:** Phone switches off automatically under heavy camera or GPS load.