Since JuiceDefender is long gone further developed, I looked around for an alternative, and I am came across this app. I find really great this app, as it controls the data connection to the stabled parameters (eg every 30 min for 1 min to activate the data connection). Of course, saves a lot of battery, provided that all the settings are correct.
As a small tip for the night mode - Provides data retrieval to 8 hours and only after unlocking the screen. So you can even late at night still wets the ^ - ^
