Android L Improves Battery Life by 36% in Ars Technica’s Benchmark

Spider

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By Edgar Cervantes July 1, 2014

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Android L is Google’s biggest update to its mobile operating system. We are expecting wonders when it comes to design, performance and new features, but it seems we didn’t give battery life improvements too much attention. This is probably due to us simply assuming it wouldn’t really be a huge jump, but we may have underestimated Google’s work.

Google’s “Project” tradition started with Jelly Bean and Project Butter, which made the UI incredibly smooth. KitKat offered Project Svelte, which allowed lower-end devices to run the software more efficiently. Next up is Project Volta, which is much more than a small improvement in battery efficiency.

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The test


Ars Technica’s latest tests prove the new software boosts battery life by about 36%! This is no normal battery test, either. Ars Technica went all out and was as precise as possible. Both software versions were tested with the same Nexus 5 smartphone, managing to avoid battery variations. Screen brightness was set to 200 cd/m2, which was verified by a colorimeter.

The test consists of leaving the display on and loading a website every 15 seconds (over WiFi) until the device finally gives up and dies. This was ran on Android 4.4.4 first. Android L was then flashed to the same device and the test was applied again.

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What is different about Android L?


Project Volta relies on different techniques to extend battery life. For starters, the new battery-saving mode is said to add an extra 90 minutes of battery life, but this test didn’t quite rely on that.

Google discovered waking the device for a second takes away about 2 minutes of standby time. And this doesn’t necessarily involve turning the screen on, this happens every time an app wants to perform a background action and wakes the processor. The new JobScheduler API allows these tasks to be grouped together, instead of having them act individually.

It’s also important to note Android is now using ART instead of Dalvik, which is known for offering better power efficiency.

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Wrap up


This is only a glance at what Android L could offer. More apps need to be optimized to run well with Android L, meaning battery performance could get even better in the future! We are certainly more excited about Project Volta now that we have seen it in action.
 

edap

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Dec 12, 2012
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It's great if battery life is better during active use, but if idle drain is like a running river, that is not exactly a win.
 

Spider

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It's great if battery life is better during active use, but if idle drain is like a running river, that is not exactly a win.

Where did you hear about heavy idle drain on Andoid L? I haven't read a word about it anywhere.
 

edap

Senior Member
Dec 12, 2012
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I'm sceptical about the performance of the apps. Will developpers optimize their products in tandem with Project Volta's battery enhancements?
 

Spider

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Glad to hear you haven't actually seen anything about an Android L "idle drain", I thought I might have missed it.
 

richyoung

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Sep 22, 2010
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Glad to hear you haven't actually seen anything about an Android L "idle drain", I thought I might have missed it.

This implies idle drain will be much better with L. Especially if you have a lot of background app activity...

"Google discovered waking the device for a second takes away about 2 minutes of standby time. And this doesn’t necessarily involve turning the screen on, this happens every time an app wants to perform a background action and wakes the processor. The new JobScheduler API allows these tasks to be grouped together, instead of having them act individually."
 

Awesome1986

Junior Member
Dec 8, 2014
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Wow, it sounds great that battery works much better, that is really big plus in comparison with android 4.4 kit kat
 
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