Battery Doctor by Beijing Kingsoft is one of the most popular iPhone/iPad apps, and for good reason. This is personally one of our favorite apps for iOS. It has a great user interface, useful feature set, and it is frequently updated.
More than 50 million users love Battery Doctor. The latest version includes powerful memory optimization, a list of power consuming apps, and an optimized charging function to maintain your iPhone battery. It is compatible with iPhone, iPod Touch and iPad. It requires iOS 4.3 or later. Battery Doctor is an iPhone 5 optimized app.