Eton has uncovered their new battery pack for iPhone 4 dubbed as Eton Mobius. Eton Mobius iPhone 4 battery pack provides 1800mAh external battery, which practically doubles the iPhone battery life in certain environments, settings and conditions. What’s great is Eton Mobius iPhone 4 battery pack has come with a built-in monocrystal solar panel at the rear side to harvest natural energy.
The monocrystal solar panel can generate about 20 minutes of talk time for every hour of direct sunlight charging. Eton Mobius iPhone 4 battery pack will add about 20mm of thickness to your iPhone 4, and you have to remove any existing sleeve or protection case before you can install this battery. But no worry, Eton Mobius is a kind of battery case that comes with its own case for your iPhone 4.