by Jim Lynch

iOS 9: Enable Low Power Mode on your iPhone

Aug 19, 2015

Extend your iPhone's battery life with Low Power Mode in iOS 9

iOS 9 has some terrific new features, and a couple of them are designed to extend the battery life of your iPhone. The first feature is called Low Power Mode. Low Power Mode temporarily lowers power consumption by stopping mail fetch, background app refresh, automatic downloads. It also reduces or turns off some of iOS 9’s visual effects.

The second feature conserves battery power by letting you put your iPhone face down on a surface to stop the screen from lighting up when you get a notification. Put your iPhone down face up and the screen will light up as usual.

enable ios 9 low power mode

Enabling Lower Power Mode in iOS 9 can extend your iPhone’s battery life by up to three hours or so. 

In this tip I’ll show you how to enable Low Power Mode manually in iOS 9 for the times when you want to use the lowest amount of power possible on your iPhone.

How to enable Low Power Mode in iOS 9

Enabling Low Power Mode in iOS 9 is quick and easy. Just follow these steps to do it:

1. Tap on Settings.

2. Tap on Battery.

3. Tap on the Low Power Mode switch to turn it to the green (on) position.

And that’s it, now Low Power Mode is enabled on your iPhone. You should see that your battery icon at the top of your iPhone’s screen is now a yellowish color so you know that Low Power Mode is on. Low Power Mode can get you about three hours or so of additional battery life in iOS 9.

The benefits of Low Power Mode in iOS 9 come at a performance cost

However, nothing in life is free and the benefits of Low Power Mode do come at a cost in terms of performance. When Low Power Mode is enabled, your iPhone’s CPU performance may drop as noted by this report on the MacRumors site:

Geekbench 3 has just been updated to work with iOS 9, letting us get a more detailed look at how Low Power mode works and how much it throttles an iPhone’s CPU performance when activated.

Without Low Power mode activated, an iPhone 6 Plus scored 1606 on the single-core processor test and 2891 on the multi-core processor test. When Low Power mode was turned on, the same iPhone 6 Plus scored 1019 on the single-core test and 1751 on the multi-core test, suggesting there’s a significant performance reduction when Low Power mode is enabled to save as much battery as possible.

ios 9 low power mode performance benchmarks MacRumors

Results were similar on an iPhone 5s, with performance reduced by about 40 percent. We saw single/multi-core scores of 1386/2511 without Low Power mode and scores of 816/1405 with Low Power mode turned on.

More at MacRumors

Are the benefits of Low Power Mode in iOS 9 worth it?

It’s a bit of a bummer that having Low Power Mode enabled in iOS 9 comes at a performance cost. But three hours of additional battery life is nothing to sneeze at for most people. So is it worth it to give up some performance for longer battery life in iOS 9?

I think it really depends on what you use your iPhone for in the first place. If you play 3D games then you are probably not going to want Low Power Mode enabled on your iPhone because it has the potential to negatively affect your gaming experience. But if you don’t play games or run other performance-hungry apps then Low Power Mode can work very well for you to get the most out of your iPhone’s battery life.

I fall into the latter category, I actually like Low Power Mode a lot. I don’t play many games and I don’t care about mail fetch, background app refresh, etc. So Low Power Mode works very well for me and lets me use my iPhone for longer periods of time without needing to charge it.

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