Imagine going a week without recharging your phone. British power technology firm Intelligent Energy has developed the world’s first hydrogen-powered battery that creates its own electricity by combining oxygen and hydrogen together with its own patented technology, at the expense of a small amount of heat and water vapor waste. The prototype is a built-in, rechargeable fuel cell that does not add to the size of your iPhone, and has the capacity to charge it for about seven days and can be refueled with hydrogen via its headphone socket. Complex reports on how Intelligent Energy is closely working with Apple for the product, which is currently only compatible with iPhone 6 models. Company executives are also still finalizing the battery’s retail price point.