Olixar enCharge 15,000mAh Dual USB Power Bank

Best price: £34.99 | Capacity: 15,000mAh

This unit provides all Apple users will need, as it includes 30-pin and Lightning adapters plus mini and micro USBs among others. There are power and charging leads and a four-stage LED battery monitor. You also get two USBs, including a faster 2.1A, and, oddly, an SD card reader. Charging was a touch behind our winner, and you pay for that extra kit and capacity.