Mophie updates its Juice Pack Plus battery case, offering compatibility with all iPhone 4s, …

Third Rail Mobility introduces its Third Rail System battery case for smartphones that includes the Slim power-ready protective case and Smart Battery universal, interchangeable, removable battery. Unlike other smartphone battery cases, Third Rail’s system provides several different usage modes in one simple system – functioning as a protective case, a power case, a portable external charger and a power hub for charging multiple devices at one time.

mophie is launching a new  juice pack air (model 1145_JPAXP4-VZ) that works with both AT&T and Verizon iPhone 4. The new …

PADACS, a brand offering accessories for iDevices, introduces two new PowerCase battery cases for iPhone 4. The PD-126-16 model comes with 1600mAh battery while the …

iKit launches the new iPhone 4 NuCharge case design to protect your iPhone 4 while offering extra power. With 1400mAh built-in battery, the NuCharge case doubles the battery life of iPhone 4. The case is just 6mm thick and comes with blue LED light to indicate battery life. It also has an integrated kickstand for landscape viewing.

aigo launches the aiPower i616 that claimes to be the best iPhone 4 battery case ever. The aiPower i616 is a lightweight protective and ultra-thin case with built-in rechargeable battery pack. One of the main features of the case is its integrated mini USB cable so you no longer need a separate cable for charging and sync.

mophie announced the new juice pack plus battery case that offers more than double of iPhone 4‘s battery life. The new juice pack plus is a ultra slim and ultra lightweight battery case with 2000mAh battery capacity, offering iPhone 4 power users with more than double the battery life on-the-go. It features dual injected rubber grip for extra hold.

Just got an iPhone 4 and you are looking for a case and an external battery pack? Take a look at Dexim’s DCA224 Super-Juice Power Case that combines protective and battery. The DCA224 comes with built-in 2000mAh lithium polymer battery that offers up to six extra hours of talk time, 40 hours of music and up to 10 hours of video/game.

Energizer introduces the AP1201, a rechargeable battery case for iPhone 4. The AP1201 offers almost twice of the power of the iPhone, while protects your iPhone. It features “smart” battery technology that auto senses the iPhone 4 battery power status which is indicated through hidden LED’ on the back of the case.

Mophie launches its new juice pack air lightweight, slim external battery case for the iPhone 4. The juice pack air basically combines an rechargeable external battery and a protective form-fitting hard shell case with soft-touch, rubberized finish, offering both extra power and protection to your iPhone 4.