A new feature on the new iPhone XS and XS Max, which are rumored to be unveiled at a Sept. 22 event, has some iPhone X owners worried that their battery life may be suffering.

The feature is called Battery-Eating Mode, and it’s meant to help reduce battery drain during normal use.

Apple’s description of the feature:You can disable Battery-eating Mode by selecting the Settings icon from the Home screen and tapping Battery- Eating Mode.

The screen will flash yellow and you’ll see a bar on the bottom of the screen to indicate whether Battery-eatening Mode is turned on or off.

You can also tap Settings to turn Battery- Eating Mode on or Off.

It appears to only affect the new iPhones, and the feature doesn’t appear to affect older iPhones.

We’ve reached out to Apple for comment and will update this article if we hear back.

Apple’s Battery- eating mode was first reported by AppleInsider.

The feature’s description on Apple’s site suggests that users can turn the feature on or OFF by selecting Settings from the home screen.

Apple has been teasing Battery- Eater Mode since the iPhone 8 launch, and AppleInsiders has reported on previous leaks that indicated that the feature might come to the iPhone 9 in the next few months.

The new iPhone 9 is rumored to have a larger display, and has a more powerful CPU.

AppleInsider’s report said that Battery-eating Mode “can be disabled by going to Settings > Display > Battery- Saving Mode.”

While we’ve seen plenty of other features from Apple to improve battery life, this is the first time we’ve heard of Apple actually implementing the feature.

We don’t yet know what Apple plans to do with Battery- eating Mode when the iPhone 10 comes out, but it’s likely that Apple will offer more detailed information about it at a September 22 event.