Android is one of the most battery hunger OS out there and this issue has been always a subject of criticize. Battery Defender-Battery Saver Android App is a simple but very useful app to save and boost battery life of your Android Device.
The best part of the app is it works automatically. The app itself automatically disable wifi and data connection after you turning off your screen(with 15~20s latency), and Genius Sync, allow app to sync every few minutes but save battery. Another great feature is Quiet sleeping. Disable data network and wifi connections when you are sleeping. Sleeping time can be adjusted as your prefer.
Download Battery Defender-Battery Saver For Android From Android Market
Download Battery Defender-Battery Saver For Android Direct Install