Here's how you can download the Deep Sleep Battery Saver app free for Android devices.
1. Go to the Google Play page for the free app Deep Sleep Battery Saver.
2. Tap the Install button.
Here's a description of Deep Sleep Battery Saver:
"Deepsleep battery saver constantly puts the device to deepsleep mode while screen off
LifeHacker: "Plenty of apps save your battery life, but this one takes the idea to a whole new level"
During deepsleep mode, Wifi, 3G are turned off, background apps are stopped. Therefore, most apps are not working, including Facebook, Google Service, etc,. It then constantly wakes up in order to download email, sync Facebook status, etc,. It's defined by deepsleep frequency and woke up duration
In advanced mode (PRO), you can customize more parameters, including day/night settings, active period, screen timeout, sync strategy, ignored apps, etc,"