AA battery 'powers mobile phone for 15 years' It always seems to be when a phone is needed most that its battery decides to die but one company believes a spare device could be the answer. Dan Simmons looks at a phone which runs on a single AA battery and can last - if it is left off until needed - 15 years without running out. Also, Marc Cieslak looks at a how one device can make a phone feel all shook up. Follow the Click team on Twitter @BBCClick. And join the conversation on Google+ or Facebook.