It's hardly surprising that the Robot Head Portable Charger is the number 1 selling portable charger in Japan (when it comes to tech, those guys really know their stuff). For it's perky pocket-size it packs in an unrivalled 6000mAh battery that will charge your smartphone 2.5 times from flat.
Based on the loveable cardboard character known as Danbo, this bionic battery box is powerful enough to cater for your tablets, digital cameras and most other USB-powered gadgets. Just plug in your own charging cables, and with the beautifully convenient pair of USB outputs you can charge two devices at the same time.
The robot itself is juiced up via the included Micro-USB cable, just give his mouth a press and his beady little eyes light up to indicate how much power you've got left.