Back-up batteries and solar chargers are fine, but if you’re in a real emergency where phone power is a must, both can be cumbersome and time-consuming. A new gadget on Kickstarter clears through the clutter and puts the power back in your hands–literally.
Finding a way to provide light and power to those in developing nations is challenging.
Nickel-iron batteries, a rechargeable technology developed by Thomas Edison more than a century ago, have been largely out of favor since the 1970s - until now.
Soon, devices such as phones and laptops could charge themselves thanks to displays that double as solar cells.
The British hacking suspect arrested last week has been named as 18-year-old Jake Davis, from the remote Shetland island of Yell.
British festival-goers this summer no longer need to worry about charging their phones - as long, that is, as they're not too bothered about their eardrums either.
MIT reckons it's overcome one of the biggest barriers to the acceptance of electric cars - the time it takes recharging them - while at the same time halving the cost of batteries.
As if it weren't irritating enough to have to listen to people on their mobile phones, a South Korean team has just given people an excuse to yell into them even more loudly.
Cellphones can recharge in a matter of minutes with a new battery technology developed by the Department of Energy and Vorbeck Materials.
Cyclists are often into renewable energy. It's obviously something Nokia has noticed, which is why it's launched a cellphone charger that draws its energy from the cyclist's pedal power.