Many iPhone owners know the dread of seeing the 'Low Battery' notification appear on the screen.

But a tech expert has uncovered a 'hidden' setting that he claimed could nearly double the device's life. 

Herby Jasmin, the founder of the tech site Gotechtor, said the trick is adjusting a phone's 'Reduce White Point' feature.

The feature creates a small adjustment to the iPhone's display that reduces the glare and dims the brightest colors on the screen.

Users can locate Reduce White Point under the settings app on the iPhone's iOS system.

'Since I changed this setting on my iPhone, I’ve noticed that my battery life has nearly doubled compared to what it used to be,' Jasmin claimed in a post.

The tech expert said he was playing with the Settings app when he stumbled across the 'Reduce White Point' option, which adjusts the intensity of colors on the screen by dimming bright hues like green, white and yellow.

The phone automatically reduces the bright colors, but users can manually dim them to adjust the intensity further.

Users should go to the display and text size option under the accessibility section in settings to access the Reduce White Point feature.

It can also be tailored to activate during certain hours or when the sleep focus option is enabled. 

But Jasmin claimed it will help conserve your battery because the iPhone is using less energy by not having to keep the screen as bright as it normally would be.

Activating the Reduce White Point feature can not only conserve your phone's battery, but can have the added impact of reducing eye strain and fatigue.

When colors on your phone less vibrant, especially in darker environments like when you're scrolling in bed, it helps alleviate eye strain and reduce the amount of blue light emitted that disrupts sleep.

'Most people use smartphones for shorter periods of time throughout the day but can accumulate many hours of usage by the end of the day,' according to the KRAFF Eye Institute.

'Although this is less stressful for the eyes, if you’re straining when you look at your cell phone screen, it can mean you're placing stress on your eyes resulting in mobile phone eye strain. Over time, this can negatively affect your eye health.'

The advice comes as Apple has received criticism for its lithium-ion batteries which naturally degrade over time, reducing the charge a phone can hold to 80 percent.

Apple is readying itself to introduce the new iPhone 16 next week, which is expected to offer a better battery life and an Organic Light-Emitting Diode (OLED) display that is easier on the eyes than previous light-emitting diode (LED) displays.

In his post, Jasmin suggested that those who don't want to make the jump to the new iPhone should consider simply adjusting the white point feature for now.