The Mili offers Spring Power 4 (HI-C23), who claimed to be the slimmest external battery for iPhone 4. The Mili iPhone Case No. 4 of the 1600mAh battery has a capacity that offers up to 450 additional hours of standby, 7.5 hours talk time, 7.5 hours of 3G Internet use.
It is also have 13.3 hours of Internet WiFi, 15 hours of video playback and 45 hours of audio playback. The Power Mili spring 4 measures 124 x 62 x 15mm and is available in different colors. It uses a mini USB port for recharging.
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It’s being shipped Aug. 7th and available for pre-order with a discount and free shipping.