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The LAX battery packs a powerful 10,000 mAh battery which is enough to charge an iPhone more than three times. Despite all that power, it has a compact size. LAX says it's the size of a credit card, but that only describes the width and height. When you include the depth, it's more like the size of a deck of cards, which is still quite pocketable. It also has a nice, comfortable, rubbery grip. Mine is basic black but it also comes in gray, red, or pink.
The power is provided in two 5V/2A USB ports so it can also feed power-hungry devices like an iPad. Another nice touch is that it is 1.2 Meter drop tested to military standard.
If you need power on the go, the Mini External Battery Backup Charger from LAX Gadgets delivers 10,000 mAh.