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
And join the conversation on