When I was surfing on the internet, I found interesting gadget. Its call Kraftwerk. Kraftwork is a portable battery which uses butane fuel to produce energy. One full fuel of butane gas will make 6 to 7 iPhone fully charge. The Kraftwerk is owned by eZelleron Inc. and it is now on Kickstarter. I have thought about to fund them, but the only funding selections are over 100 dollars… However, if it goes on retail, the price will be 147 dollar per each piece. Some of the funding is still available, so check it out if you are interested in unique gadgets!