Eton's focused a lot on solar-powered iPod and iPhone accessories, including Soulra-branded speakers, so the release of a new solar-powered battery case called Mobius ($80, aka NSP300B) is right in line with its earlier efforts. Mobius combines an 1800mAh battery -- enough for around 80% of an iPhone 4/4S recharge -- with a rear solar panel that is said to be "high efficiency," but takes quite a while to refuel: one hour of solar charging time…
