Generic dealer USBfever has released a second Portable Power Station intended for the iPhone. The device serves as a backup battery, temporarily recharging the internal one when connecting to wall socket is impractical; it attaches directly to an iPhone's dock connector, and starts the recharge process immediately. A second port at the base of the PPS2 lets users charge both the internal and external batteries simultaneously, or alternately sync with a computer as usual.

Unlike the standard PPS, the new version is only rated at 800mAh, and cannot fully charge an iPhone; it is however considerably more compact, and is also able to recharge third-generation iPod nanos. USBfever has priced the PPS2 at $28.