When shopping for iPhone accessories, users often have to buy a few devices to meet all of their needs. Protective iPhone cases, charging devices, syncing cables and whatever else they might need can create a lot of bulk to carry around.

The PowerShadow i4 Battery Case and Charge/Sync Dock for the iPhone 4/4S offers an accessory for users who like convenience and diverse functionality all from one device.

Made by Spyder, the case features a 2000 mAh battery and offers users complete control over whether it delivers power to the iPhone. When used to power the iPhone, the i4 case adds eight extra hours of 3G talking time. Users can access all of the iPhone's features without removing it from the case, as well as charge and sync their phones. The case is also made with a protective polycarbonate frame and finished with rubber, so it'll protect the iPhone from the usual array of falls, bumps and scrapes.

For iPod and iPhone users just looking to extend battery life, Spyder also offers the i4X Battery extender. The 1500 mAH battery offers 15 extra hours of music or four hours of video.