Aug 26, 2010 13:06 GMT  ·  By

Powerskin has announced the availability of its MiLi Powerspring, the world’s highest capacity external battery for iPhone 4, according to a list of specifications posted by the company.

“You and your iPhone 4G can experience amazing moments with the latest MiLi PowerSpring 4 Extended Battery,” the description reads at powerskin.co.uk.

“Enjoy internet surfing, phone calls, music and movies without worrying about shortage of battery,” Powerskin notes.

The tool can even be used to maximize the iPhone’s vibration features, the company claims.

Just like its predecessors, the iPhone 4 boasts a built-in rechargeable lithium-ion battery which charges via USB to a computer system or power adapter.

It offers up to 7 hours of talk time on 3G, and up to 14 hours on 2G. Standby time is around 300 hours.

Internet use goes up to 6 hours on 3G, and up to 10 hours on Wi-Fi. Video playback is roughly10 hours. Audio playback - up to 40 hours.

MiLi PowerSpring 4 Extended Battery can extend video playback time by 5.4 hours, audio by 19 hours, and Internet surfing by almost four hours, Powerskin suggests.

The Mili PowerSpring 4 starts shipping today for for $85 on Amazon, where the giant retailer posts the following key features:

- The worldwide highest capacity external battery for iPhone 4.

- Product Dimension: 124 x 62 x 15 mm

- Technical Specifications: Input: DC 5V/500mA, Output: DC 5V/500mA, Capacity: 1600mAh(Li-Pol)

- Standby Time: Up to 450 hours, Talk Time: Up to 7.5 hours on 3G, Up to 16.7 hours on 2G, Internet Use: Up to 7.5 hours on 3G, Up to 13.3 hours on Wi-Fi, Audio Playback: 45 hours, Video Playback: 15 hours

- Package Contents: MiLi Power Spring 4, Mini USB cable, User's Manual

Visit Powerskin here for more information.

Photo Gallery (2 Images)

MiLi Powerspring for iPhone 4
MiLi Powerspring for iPhone 4 (without iPhone)
Open gallery