Complete Guide to Optimizing Battery Charging on iPhone

  • When Optimized Battery Charging is on, your iPhone will not be fully charged until you need to use it.
  • Improved battery charging makes iPhone charging slower, but it also keeps the battery healthy for longer.
  • If the iPhone remains fully charged for a long time, it may damage the battery.
  • Visit Insider’s Tech Reference Library for more stories.

If you’re like most people, you probably keep your iPhone connected to a charger while you sleep. This ensures that it’s fully charged when you wake up, ready to go all day.

Unfortunately, keeping your devices connected to a charger all the time is not always a good idea. If your device battery is fully charged, but you keep charging it, the battery will slowly wear out until it can no longer charge at all. A battery’s ability to hold a charge is known as “battery health,” and it’s important for phones, computers, tablets, and more.

This is where Apple’s Enhanced Battery Charging feature comes in. Optimized Battery Charging (or OBC for short) is a feature that prevents iPhone from charging in order to protect the health of its battery. This might sound like a bad thing, but trust us – it’s a great feature.

Here’s how Optimized Battery Charging works, and how to turn it on or off.

How Optimized Battery Charging keeps your iPhone battery healthy

As mentioned, if your iPhone is fully charged but you are still connected to a charger, you are damaging the battery. Charging an already fully charged battery wears out its components and chemicals, making it more difficult to conserve power.

To be clear: Let’s say when you bought your iPhone, a full charge would keep the phone alive for 24 hours. A battery that has drained due to overcharging may only last 20 hours, then 15 hours, then 10 hours. In the end, it won’t last for that long.

Optimized battery charging helps prevent this. While OBC is on, your iPhone will charge slower, reducing the amount of time it spends fully charged and plugged in. This keeps the battery healthy, and makes each charge last longer.

Your iPhone displays a message that says

You will see this message while charging your iPhone overnight.


The feature works by studying your schedule, recording when you use your iPhone and when you leave it to charge it. If you plug in your iPhone before going to bed, it will charge until it reaches 80 percent, then stops. It will then wait for the charging to complete until the alarm goes off right away. No need to worry about overcharging while you sleep – OBC takes care of it.

So while that means you’re making your iPhone charge slower, it’s a net benefit in the long run. A healthy battery keeps your iPhone powered on for longer, and lets you get more value with every charge.

Enhanced Battery Charging is available on all iPhones with iOS 13 (released in 2019) or later. If you are not sure what iOS version you have, you can check using the Settings app.

Optimized battery charging should be enabled by default on every new iPhone. But if you want to check, or if you want to turn off the feature, you can do it quickly.

How to turn Optimized Battery Charging on or off

1. Open the Settings app on your iPhone and scroll down to select battery.

2. handle Battery health.

3. On the Battery Health page, you can see how healthy your battery is. To enable or disable OBC, tap on the switch labeled Optimized battery charging.

Battery Health menu on iPhone, with the Optimized Battery Health option highlighted.

Press the toggle switch to turn OBC on or off.

William Antonelli / Insider

If you are turning it off, you will also have to choose to turn it off temporarily or permanently.