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

Here is a new dual-SIM case for iPhone 4 that supports dual standby and doubles as a power pack. After you attach the battery case to your iPhone 4, you will have two SIM card slots – the original Micro SIM slot of the iPhone 4 and a mini SIM slot on the case. Compare to another dual SIM case, the new case supports dual standby, meaning both SIMs are active at the same 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.

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.

Kengsington launches the new PowerGuard battery case with card stand for iPhone 4. The case protects your iPhone, at the same time offers four extra hours of talk time, 5 hours of video playback and 22 hours of audio. The PowerGuard comes with a card that turns the PowerGuard into a two-position stand that holds your iPhone 4 handsfree in portrait or landscape mode.

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.