Why My iPhone Won’t Charge Past 80?- (6 Causes & Fixes)

Did you place your iPhone on a charger for more than 3 hours, but it’s only 80% battery charged? Thousands of iPhone users have noticed this problem in recent months, which can be fixed easily.

So, why won’t your iPhone charge past 80? Apple introduced Optimised Battery Charging in iOS 13 that reads your charging pattern and stops the charging at 80 to prevent battery aging. By default, Optimised Battery Charging comes enabled in the settings; that’s why your iPhone won’t charge past 80. Also, if your iPhone is overheated, it might not charge fully.

Apple also restricts charging batteries to 80% to increase the overall lifespan. But you can force to charge your iPhone battery to 100% by overwriting the default settings in iOS.

In this guide, we’ll see the various reasons why an iPhone won’t charge past 80 and how we can fix it.

Why Won’t My iPhone Charge Past 80?

iPhone Connected to Charger

Apple introduced Optimised Battery Charging feature in iOS 13 to slow the charging speed above 60 percent and even stop the charging past 80.

Charging the battery 100 percent might put extra strain on the Li-ion battery and degrade its health in the long run.

That’s why Apple recommends charging the iPhone 80 percent only. This helps in increasing the overall battery health.

Also, if you are charging your iPhone wirelessly, it heats up. High temperature is not good for Li-ion batteries.

Hence Apple stops charging at 80 percent to save battery health.

Another major reason iPhone won’t charge fully is a faulty or damaged battery.

So, if your iPhone is over two years old, check its battery health from the settings and replace it if it is below 70.

How To Charge an iPhone to 100 Percent?

Despite the battery health concerns, some people want to charge their iPhones 100 percent when traveling somewhere.

Fortunately, it is possible to do so by overwriting the default settings in iOS and some other tips.

Here’s how you can charge your iPhone 100 percent:

Method #1- Turn Off Optimised Battery Charging

If your iPhone battery is not charging past 80, then the first thing you should do is- turn off the “Optimised Battery Charging” feature from the phone settings.

Follow these steps to disable the optimized battery charging option in iOS 15 or later-

iOS Battery Health
iOS Turn Off Optimised Battery Charging
  1. Go to Settings on your iPhone.
  2. Scroll down and tap on Battery.
  3. Tap on Battery Health.
  4. Toggle off the Optimised Battery Charging option.
  5. Tap on Turn Off Until Tomorrow or Turn Off permanently.

Method #2- Cool Down Your iPhone

iPhone Cooler

If you’ve disabled the Optimised Battery Charging from Settings, but your iPhone still won’t charge past 80, then there is a possibility that your phone is hot.

Apple continuously monitors the condition of iPhones and pushes regular iOS updates to fix the heating issues.

It heats your phone if you’re doing graphics-oriented tasks on your iPhone on hot sunny days.

Now, when you connect your lightning cable to your iPhone, it simply won’t charge.

To fix this, you need to wait for your iPhone to cool down and then try charging it.

You can also power off your iPhone and leave it below the air conditioner to cool down quickly.

Method #3- Use Original Lightning Cable & Adapter

Apple Power Adaptor

If the heating issue is not resolved and your iPhone still won’t charge past 80, then there might be a problem with your charger or lighting cable. Try using another original Apple charger or cable and see if it works.

Method #4- Use Another Power Source

iPhone Wireless Charging

If you’re using an iPhone 11 or a later model, you can charge your iPhone wirelessly with Qi-certified chargers. If you’ve access to one, use it to charge your iPhone fully.

Also, you can charge your iPhone with MacBook. Connect your iPhone to the MacBook with a lighting cable, and then keep it charging until 100 percent.

This is an ideal way to charge your iPhone if you’re traveling and don’t have access to wall chargers.

Method #5- Update iOS

iOS Update Notification

An outdated iOS version might also be a reason why your iPhone is not charging fully.

Go to Settings -> General -> Software Update and see if an iOS update is available.

If yes, install the updates and then try charging your iPhone to 100 percent.

Method #6- Factory Reset Your iPhone

Did you know that a factory reset can also help in fixing iPhone won’t charge issues? It will also fix many software-related issues.

A factory reset will delete all the data stored on your iPhone and restore it to its original condition.

iPhone Factory Reset

To factory reset your iPhone, go to Settings -> General -> Reset -> Erase All Content and Settings and enter the lock screen password to perform the reset.

Conclusion

These are some of the methods that can help you charge your iPhone 100 percent. I hope one of these methods will surely work for you, and you’ll be able to bypass the 80% charging restriction on your iPhone.

About Daniel

Daniel is a tech enthusiast and repair technician who loves experimenting with various gadgets and home appliances. On this blog, he shares a troubleshooting guide for software and hardware faults.

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