iPhone 11 battery draining fast after iOS 18 Update

Here are a few insights from Apple Support’s official iPhone Battery Drain help page. 

Did you recently update your iPhone to a new version of iOS? 

• If you've recently updated your iPhone, battery life might drain faster than usual for a few days. Background tasks like indexing and syncing can temporarily affect performance, so give it time to stabilize.

Battery Suggestions

• Auto-brightness: Enable auto-brightness to reduce battery usage.
• Auto-lock: Activate auto-lock to prevent the screen from staying on unnecessarily.
• Reduce Brightness: Lower your screen brightness if it's set too high.
• Background Location: Limit location access for apps to "While in Use" to conserve power.

Battery Usage Overview

• Check Activity & Battery Usage by App: Go to Settings > Battery to see which apps are using the most battery. Adjust settings for apps consuming excess power.

Other Battery Saving Tips

• Use Wi-Fi: When possible, connect to Wi-Fi, as it consumes less battery than cellular data.
• 5G Auto (iPhone 12 & later): Enable Smart Data mode to automatically switch between 5G and LTE to save power.
• Low Power Mode: Activate this mode to reduce power consumption when the battery is low.

Battery Health

• Check Battery Health: Go to Settings > Battery > Battery Health to see your battery’s condition. If "Service" appears, consider replacing the battery.

After an iOS update, it's common to experience an increased battery drain as certain tasks related to the update continue in the background including indexing, you should only experience this increased battery drain for a few days before it goes back to normal.

⇢ If the battery in your iPhone drains too quickly - Apple Support