Never get caught with a dead battery again, thanks to today’s ultra slim credit card-shaped PowerBank. With an ergonomic design, small enough to pop in your wallet, the clever gadget is both practical and sleek. When charged up in advance, it can be used to power your smartphone whether you’re on the bus, at the pub or out shopping. Plus, it comes in a fashionable blue and white design and is compatible with iPhones that use 8-pin connectors (5/5s/6), Samsungs, HTCs and more. You'll also get a micro USB charging cable for an easy way to charge the PowerBank itself. Nifty!