You can never carry too many backup charging cables, and since you probably never leave home without your wallet, the ChargeCard is the perfect accessory for battery-sucking smartphones. It's only slightly thicker than a credit card, and lets you leech power from any available USB port.

The ChargeCard actually started life as a Kickstarter project, but managed to reach the production stage after raising sufficient funds. And while the microUSB and iPhone 4 dock connector versions are finally shipping, it's the new iPhone 5 Lightning version that has us most excited. It's available now for pre-order, and for £18 you can guarantee yourself one come mid-May. [ChargeCard via SlashGear]