How to Fix iPhone Battery Drain on iOS 18

After installing iOS 18, many iPhone owners notice that their device loses charge much faster than before. The battery may drop from 80% to 50% in a short period, or the phone may shut down unexpectedly even though the indicator shows a higher percentage. Our support team has identified the most common triggers and has put together a reliable set of fixes that have helped hundreds of users restore their battery endurance.

The issue usually originates from background refresh settings that become more aggressive after a major update, or from a corrupted cache that persists after the upgrade. In some cases, a worn‑out battery or a non‑certified charging cable can make the problem worse, but the steps below address the software side first. By following these procedures, you can often reclaim the normal runtime you expect from your iPhone.

Here is a quick overview of the symptoms and the primary fix:

  • Symptom: Rapid discharge, unexpected shutdowns, battery percentage jumps.
  • Primary fix: Perform a force restart and reset location services.

Step-by-Step Solutions to Fix the Issue

Fix 1: Force Restart and Reset Settings

  1. Force Restart: Press and quickly release the volume up button, then press and quickly release the volume down button, then press and hold the side button until the Apple logo appears. This clears temporary memory and can stop runaway processes that consume power.
  2. Reset Location Services: Open Settings, tap Privacy, then Location Services. Toggle the switch off, wait five seconds, then turn it back on. This stops apps from constantly querying GPS, which is a known battery drain.
  3. Reset All Settings: In Settings, go to General > Reset > Reset All Settings. You will need to enter your passcode. This action restores default preferences without deleting your data, ensuring that any accidental changes made during the update are undone.

Fix 2: Disable Background App Refresh

Background refresh allows apps to update content while they are not in use, which can significantly reduce battery life. To disable it, open Settings, select General, then Background App Refresh. Turn the toggle off for every app, or at least for those that you do not need to receive real‑time updates from. This simple change can prevent dozens of small data requests each hour.

Fix 3: Update Apps, Check Battery Health, and Use Certified Accessories

Outdated apps often contain code that is not optimized for the latest iOS version, leading to extra power consumption. Open the App Store, tap your profile icon, and install any available updates. After updating, navigate to Settings > Battery > Battery Health. If the maximum capacity is below 80%, the battery may need replacement. Additionally, using a certified charger and cable ensures that power is delivered efficiently and safely. Our store carries a selection of fully tested chargers and cables that guarantee safe and efficient power delivery, helping to maintain battery longevity.

Fix 4: Adjust Display Settings

Reduce brightness manually or enable Auto‑Brightness in Settings > Display & Brightness. Turning on True Tone and lowering the auto‑lock timer can also save power.

Fix 5: Enable Low Power Mode

Open Settings and toggle Low Power Mode on. This disables background app refresh, reduces mail fetch, and lowers performance to extend battery life.

Applying these fixes in order usually restores normal battery behavior. If the drain continues after completing all steps, the hardware may be the limiting factor. In that case, visiting the Phone2Charger store to browse our inventory of replacement batteries and high‑quality charging solutions is a practical next move. Our accessories are engineered to provide consistent power and protect your device from voltage spikes, ensuring that your iPhone runs smoothly for years to come.

Related Articles