MiLi ( has released the MiLi Power Skin external battery and protective case for iPhone 3G and 3GS. Available in eight two-toned color combinations, it purportedly doubles the life of the smartphone battery and offers a protective case.

Power Skin fits like a second skin to your iPhone, and is quipped with a 1,200mAH lithium polymer battery. Its low-profile casing is designed to provide durable protection against drops or mishaps. With a slider case design the Power Skin can be removed for use on speaker docks or other media players.

It can be ordered by itself or a bundled Power Skin+, which comes packaged with a MiLi Pocketpal, an USB charger with a small foldable AC plug that compacts into a lightweight pocket-sized cube compatible with any USB device. The MiLi Power Skin (US$69.95) and PocketPal ($19.95) can be purchased separately or bundled together for a discounted $79.95.