Intelligent Energy is a British firm, which specialized in fuel-cells that can convert chemical energy into electricity. Apple being one of the largest battery buyers in the world, it's no surprise that Apple would try to purchase some patents from such a company. According to Daily Mail, that's exactly what Apple did last December. The publication writes of a secret deal went down between the two companies, along with popular battery company Eveready. Via Daily Mail: It has kept the identity of its partner a closely-guarded secret. But a source, who has knowledge of the partnership, confirmed that Apple is the big name working with the Loughborough-based firm. If the British firm can become Apple’s chosen partner in a great leap forward for energy-efficient devices, it could be catapulted into the ranks of global technology players. Potentially, the technology tied in with these patents would allow future iPhones, iPads and MacBooks to run on a single charge of days, or even weeks. The way the technology works also makes the process free and very efficient. Previously, the British firm poached Apples's former product specialist Joe O'Sullivan and appointed him as CEO. The firm also recently opened a new office in San Jose, a few miles away from Apple's Cupertino office. It's worth noting that the same type of technology is used in the Tesla Model S and Roadster. Apple has been highly interested in Tesla in the past and even had talks about buying the company. Either way, we all know the complaints about Apple's batteries in its devices, so a battery that converts hydrogen and oxygen into energy would be highly efficient.