How to Fix iPhone 16 Charging Slowly After iOS 26.1 Update

iPhone 16 Charging Slowly After iOS 26.1 Update usually happens because the phone is getting warm, optimized charging behavior changed, a cable or charger is underpowered, or a background process is keeping the battery busy after the update. The steps below focus on the fastest ways to restore normal charging speed on the iPhone 16 lineup.

Fix #1: Check the charger, cable, and power source

Slow charging often comes from weak accessories or low-output USB ports rather than the update itself.

Use a known-good USB-C cable and a properly rated power adapter.
Avoid charging from an old laptop port, car port, or cheap hub while testing.
Inspect the cable ends for debris or damage.
Try a different certified charger if you have one.

Fix #2: Let the iPhone cool down before charging

If the iPhone is warm, iOS may intentionally slow charging to protect the battery.

Remove the case if the phone feels hot.
Stop gaming, navigation, or video recording for a while.
Move the phone to a cooler room.
Charge again after the device temperature drops.

Fix #3: Check battery settings and optimized charging behavior

The update may have changed battery management behavior, especially overnight or during routine charging times.

Go to Settings > Battery > Battery Health & Charging.
Check whether Optimized Battery Charging or Clean Energy Charging is affecting your charging pattern.
Temporarily test with these features adjusted only if needed.
Monitor whether charging speed improves in the same conditions.

Fix #4: Restart the iPhone and close heavy background activity

A software refresh can stop stuck processes that generate heat and slow charging.

Restart your iPhone 16.
After rebooting, avoid opening heavy apps for a few minutes.
Charge the phone with the screen off.
Compare the new charging speed to your previous test.

Fix #5: Update iOS apps and watch for abnormal battery drain

Buggy apps can keep the phone warm and reduce charging speed after a system update.

Open the App Store and install all pending app updates.
Go to Settings > Battery and look for apps with unusually high activity.
Force close or update the worst offenders.
Test charging again after the phone settles down.

Fix #6: Clean the port and reset settings if the issue persists

Lint, partial contact, or bad settings can make the iPhone switch to slower charging behavior.

Inspect the USB-C port carefully and remove visible lint with a non-metal tool.
If the issue remains, go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings.
Set up your preferences again after the reset.
If charging stays slow across multiple chargers, consider hardware service.