Mophie on Monday introduced the “Juice Pack 3G” battery extender for Apple’s iPhone 3G. It comes pre-charged with enough electricity to double an iPhone 3G’s battery life, and costs $99.95. It will ship this fall.
The Juice Pack incorporates power management circuitry to prevent it from being overcharged, short circuiting or overheating. It also integrates four LEDs that tell you the device’s status. It connects to a host computer using a USB passthrough connector charging up.