Google puts lots of efforts to enhance battery life in every Android version but in Android M the specialized Doze mode add lots of juices to the battery .
So how Doze mode works ?Android shuts down processes in certain apps to reduce battery drain ,the new feature uses motion sensors to detect when a device hasn’t been moved for an extended period. Android will then automatically shut down processes for certain power-hogging apps, which should significantly extend the device’s battery life. It goes is more deeper sleep in Android M.
As you can see in above stats the comparison is between Android 5.1.1 and Android M developer preview 1 . Android 5.1.1 drains 4% in 8 hours whereas Android DP 1 just drained 1.5% and after 24 hours Android 5.1.1 version drained 12 % and Android M version just drained 4.% . In 48 hours Lollipop version drained 24% and Android M version drained just 9% that’s so impressive isn’t it ? . Projected maximum standby hours is 200 hours in Android 5.1.1 and 533 hours in Android M DP 1 .
Source – Computerbase.de
