If we say that there is an application that doubles the battery life of your iPhone look like a joke, but actually exists and is called BattSaver. This application does not use any trick of software or anything like that, but it gives you total control over your iPhone.
BattSaver keeps you off as many functions as possible in order to greatly improve the battery life of your iPhone. The app does not create more time as Magina, but simply more efficiently administered.
BattSaver is available in Cydia for $3.
