• Intelligent Energy says its prototype battery works by combining hydrogen and oxygen in a small fuel cell, creating water and heat byproducts. The cell ends up about the same size as an iPhone 6, but it's thin enough that it could conceivably fit into existing smartphone bodies.
  • The battery will require "charging" and users could top it off with extra hydrogen through an adapted headphone socket. A commercial version might be power a smartphone for a week, then end up being disposable.
  • According to an Intelligent Energy executive, the technology is a "couple of years out." The company also produces fuel cells for scooters and other motor vehicles.

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