About Optimized Battery Charging on your iPhone - Apple Support (2024)

FAQs

Why does my iPhone keep saying optimized battery charging? ›

With iOS 13 and later, Optimised Battery Charging is designed to reduce the wear on your battery and improve its lifespan by reducing the time your iPhone spends fully charged. When the feature is enabled, your iPhone will delay charging past 80% in certain situations.

Turning off charging optimizations can increase wear on your battery and reduce its lifespan.

As the battery's useful life is measured in full charge cycles, with only a small contribution from chronological age, leaving the battery at 80% but still connected to power achieves 2 aims: Not leaving it at 100% for long periods of time, and reducing the number of full charge cycles while still powering the phone.

A1: Optimized Battery Charging works by learning your charging habits. It stops charging when it reaches 80%, and then completes the rest 20% before you need it. 80% Limit, on the other hand, is a way to restrict charging to a maximum of 80%.

Android™ devices with the Battery optimization setting (Android 8. x and lower) can enhance battery life by placing apps in Doze mode or App Standby. The optimization setting is enabled by default. Disabling optimization may impact the device's battery life.

For most customers, the battery in your iPhone should last the whole day. You can charge your iPhone every night even if the battery isn't fully depleted. iPhone automatically stops charging when the battery is fully charged, so it's safe to keep your iPhone connected to a charger overnight.

For optimal battery health, it's recommended to charge your phone between 20% and 80%. It's best to avoid extremes, such as letting the battery reach 0% or consistently charging it to 100%. Features like "Optimized Battery Charging" can be beneficial, and it's advisable to avoid overnight charging at 100%.

In laptops, optimized charging works a little differently. By having the feature turned on, the device can stay plugged in indefinitely, but charging stays at less than 100%. When this level is reached, the battery will record a 100% smart charge, even if this level does not correspond to the battery's total capacity.

Optimised Battery Charging is on by default when you set up your iPhone. If you want to change your charging option: With iPhone 14 models and earlier, go to Settings > Battery > Battery Health & Charging and turn off Optimised Battery Charging.

It is true that not charging your battery past 80% or letting it drain to 0% all the time can extend its lifespan. It is the constant charge and discharge of electricity that wears batteries down over time.

What is the 20/80 battery rule? ›

What is the 20-80% battery rule? Simply, the 20-80% rule suggests keeping the battery of an electric vehicle charged between 20% and 80% of full capacity. It's a method of electric vehicle charging meant to improve battery life. Think of it as the green zone.

Apple warns users against prolonged skin contact with the charging cable and connector when the cable is connected to a power source. “Sleeping or sitting on the charging cable or connector should be avoided,” the company said on its website.

About 80% Limit with iPhone 15 models

If the battery charge level gets down to 75 percent, charging will resume until your battery charge level reaches about 80 percent again. With 80% Limit enabled, your iPhone will occasionally charge to 100 percent to maintain accurate battery state-of-charge estimates.

Turning off charging optimisations can increase wear on your battery and reduce its lifespan.

Whether it's a phone, cordless drill, or your car, batteries simply don't like to be full. Keeping them topped to the brim means, over time, the maximum kilowatt-hours they can hold shrinks faster than it would otherwise.

Optimised Battery Charging is on by default when you set up your iPhone. If you want to change your charging option: With iPhone 14 models and earlier, go to Settings > Battery > Battery Health & Charging and turn off Optimised Battery Charging.

Look at your charging cable to see if it's loose, unplugged, or damaged. If it's frayed or the connector is bent, this could be the reason your iPhone is charging slowly. To know for sure, try charging your phone with a friend's cable. If the borrowed cord works better, it's time to replace your cable.

Apple considers any iPhone with a battery capacity of 80% or above to be in optimal condition. In fact, Apple feels so strongly about battery health that its 1-year warranty covers any battery at 80% capacity or more. It's not unusual to see iPhones that, after one year, still have a battery capacity of 95% or above.