When Samsung rolled out its Galaxy S5, the surprise wasn’t the camera or the screen or even all the fitness tech. No, it was the ultra power saving mode, and how you could cut the colours to save on battery life, but is this tech really helping you save?

Battery life is becoming one of those features that’s hard to guarantee.

We all want better battery life that pushes on past a day, while still delivering a big screen, media playback, and a whole bunch of other nicknacks too, such as heart rate monitoring, wireless audio, compatibility for smart watches, and great cameras.

The catch of including all of this technology is that it can really dent the battery, cutting the expectations of days of life into something that’s closer to reaching a single day, if you’re lucky.

Ask owners of the iPhone 5 and 5S how much battery life they get out of their phones, and many will tell you of the problem of needing to charge daily. Unfortunately, Samsung’s Galaxy S5 caters to this expectation as well, barely lasting a day in our own tests, with power users requiring a charge nightly.

But one of the more unusual features included in Samsung’s Galaxy S5 was one included to save power.

Instead of just pulling back on the performance of the handset — which is basically what most power saving options do — Samsung has made the decision to shift to a lighter version of Android that only lets you run some critical apps (such as the phone), pulling back on the overall performance, and even dropping the amount of colours on screen, the latter of which brings the whole thing back to the days when things were in black and white.