Google Android L would Increase Battery by 40%

So, it seems like Android L would be a really good move and is expected to increase the battery performance in Android Devices.

Battery has always been sort of 'dis-advantage' in Android Devices; but this test here confirms to increase battery performance:
<a href="https://www.phonearena.com/news/Googles-Android-L-Project-Volta-boosts-battery-life-by-more-than-30-on-one-and-the-same-Nexus-5_id57797" target="_blank" rel="nofollow noopener noreferrer">Google's Android L Project Volta boosts battery life by more than 30% on one and the same Nexus 5 - PhoneArena</a>

PS: Please correct, it would be 30% boost not 40%