How to Fix iPhone 17 Charging Slowly After iOS 26.3 Update
iPhone 17 Charging Slowly After iOS 26.3 Update usually means background processes are running heavily after the update, optimized charging is delaying full power, the charger handshake is poor, or heat is forcing the iPhone to limit charging speed.
For related help, also see How to Fix iPhone 17 Wireless Charging Not Working, How to Fix iPhone 17 Battery Draining Fast After iOS 26.3 Update, How to Fix iPhone 17 Overheating After iOS 26.3 Update, and the iPhone 17 hub.
Method 1: Use a trusted fast charger and cable
Slow charging is often caused by a weak adapter, a damaged cable, or a charger that does not negotiate the right USB-C power profile.
- Use an Apple or high-quality USB-C PD charger.
- Try another certified USB-C cable.
- Compare charging speed with the screen off.
Method 2: Let the iPhone cool down
iPhones reduce charging speed automatically when they become too warm.
- Remove thick cases and disconnect battery packs or accessories.
- Stop gaming, navigation, or camera use while charging.
- Charge again once the phone returns to a normal temperature.
Method 3: Check Optimized Battery Charging and Clean Energy settings
Some charging features can make the iPhone appear to charge slowly under certain routines.
- Open Settings > Battery > Battery Health & Charging.
- Review Optimized Battery Charging and any charging optimization features.
- Test charging outside your usual overnight routine to compare behavior.
Method 4: Inspect the USB-C port and restart the iPhone
Lint, debris, or a temporary software glitch can reduce charging speed or cause repeated reconnects.
- Inspect the USB-C port carefully and remove visible lint with a dry non-metal tool.
- Restart the iPhone 17.
- Plug in the charger again and see if speed improves.
Method 5: Install app and iOS updates
Background indexing and firmware bugs often settle down after follow-up patches are installed.
- Install the latest iOS update available.
- Update heavy apps from the App Store.
- Check charging speed again after a full restart.
If the iPhone is still charging slowly after all of the steps above, visit the main iPhone 17 page for more charging and battery troubleshooting guides.