Apple is reportedly working on a secret battery project with British fuel cell firm Intelligent Energy, Daily Mail has learned from “senior sources in the U.S.,” hoping to one day embed eco-friendly fuel cell batteries in various devices including mobile phones, tablets and laptops. The technology would allow Apple to offer buyers iPads and MacBooks that can run without being charge for days and even weeks, although Apple customers will have to wait for a few years for the technology to be deployed. The iPhone has not been explicitly named in Daily Mail’s report, but it’s likely Apple would use the technology once fuel cells would be miniaturized enough to fit the slim iPhones of the future. Intelligent Energy has confirmed it