The U.S. Patent and Trademark Office has today published a patent application from Apple¬†for a fuel cell system designed to allow a MacBook to operate without external power “for days or even weeks.” The patent was published shortly after a British company rumored to be working with Apple managed to fit a fuel cell battery into an iPhone 6, powering it for a week at a time. We first reported on that project last summer.

While the patent refers only to a ‘portable computing device,’ both the text and diagrams specifically reference MagSafe, giving a clear indication that a MacBook is the device in question (even if Apple may be moving away from the system) …¬† expand full story