It's the Rolls Royce of 10,000mAh power banks.

Mophie has announced the Powerstation AC, a 22,000mAh juice pack that also supports USB Power Delivery.

Suitable for sharing power among family and friends or for users who carry multiple devices, the CP-B20 comes with a 20,000mAh battery and four USB output ports.

Looking for extra mileage on your iPhone 4? You might want to look towards the highly portable MiLi Power Spring 4: it offers up to 6 extra hours on 3G for both talk time and internet usage, and an extra 360 hours worth of standby time.