Additional iPhone 4 battery power has always been a worry for Apple smartphone owners. Numerous companies are trying to find ways to set their accessories apart in ways other than just iPhone 4 battery capacity. The SwitchBack Surge iPhone 4 battery case is one those products with a dual-functionality.

Different from many other iPhone 4 battery, SwitchBack Surge is original and authentic, utilizng a twist on the regular slider-style case. This piece of accessory is made of sturdy and shiny bl...

iPhone 4 Battery – Incipio OffGrid

The OffGrid iPhone 4 Battery Case from Incipio provides a little bit less power than the Juice Air iPhone Battery Pack: 1450mAh. The manufacturer states the battery should almost double your iPhone 4 battery life.

The OffGrid iPhone 4 battery case comes in black sturdy plastic, and similar to the Mophie pack, has a big, slide-in bottom compartment with a slide-on cap. The iPhone 4 battery case measures a bit over 2 ounces, and 5 inches tall, 2.5 inches ...