Olixar enCharge 2,000mAh Portable Power Bank
Best price: £9.99 | Capacity: 2,000mAh
About the same size as two packs of chewing gum, the Olixar kit can be carried in your pocket and makes a good budget emergency product, although charging through its single USB is a little slower than the best. It tackled our iPad, but wouldn’t work with the 3GS iPhone. You get an LED work light and a charge cable, although you’ll have to supply leads for the devices you’re using it on.