The Apple Store has begun selling a waterproof Mophie power pack that has enough juice to charge an iPhone three times over.

The Mophie Juice Pack Universal Powerstation Pro should go down a treat with festival-goers this summer as it means you won’t have to fight for that one electrical output.

With dual USB ports the Mophie Juice Pack Universal Powerstation Pro can charge up to two USB-compatible devices simultaneously, thanks to a 6000-mAh capacity, and will even be able to top up an iPad.

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So long as the ports are closed, the powerstation is both water and dust resistant to a rating of IP65 - meaning it should be able to withstand that inevitable downpour, or worse. Its rugged shell made up of rubber, aluminium and steel should also be able to withstand various knocks and bumps.

The Mophie Juice Pack Universal Powerstation Pro is available now from the Apple Store for £79.95.

What do you think of the Mophie Juice Pack Universal Powerstation Pro? Will you be buying one?