You can apply a battery case into your iPhone for easy charging, but if you want to charge multiple mobile devices, the ultra-high capacity backup battery may be more suitable for you.
This is an ultra-high capacity backup battery series that comes in three models including the Adventurer, the Destination, and the Expedition. The Adventurer is the smallest one and has 6600mAh battery capacity along with one USB port. The Expedition comes with a built-in 11200mAh rechargeable battery and dual USB ports, while the Destination also features two USB ports in order to charge two mobile devices using its 10000mAh backup battery. Moreover, all the three models have a set of 8 tips for various USB gadgets such as iPhone, Android devices, PSP and more. Apart from that, the integrated LED indicator clearly shows you the status of the portable charger.
At present the inventor of the ultra-high capacity backup battery is raising fund at Kickstarter. Pledging $30 will let you own an Adventurer backup battery, $50 for the Expedition, $65 for the Destination. If you’re interested, jump to Kickstarter official site for more details or check out the following demo video first.