The new Kindle Oasis, the next generation of Amazon’s premium e-reader line, has just been announced. The new device is incredibly thin at just 0.13 inches on one end. It achieves this thinness through an asymmetric design that puts the battery and internal components on one end of the device, which works well at providing an ergonomic grip for one handed use. While this is also Amazon’s lightest Kindle, at 4.6 ounces, that thinness and lightness comes at the cost of battery life, which is down to only 2 weeks, compared to the Kindle Voyage’s 6 week battery life. To make up for this, Amazon is including, at no cost, a new battery case that adds an additional 7 weeks of battery life. The screen is the same 300 ppi screen form the Kindle Voyage, but now with 60 percent more LEDs to give it a wider range of brightness. The new Kindle Oasis can be pre-ordered now for $289.99 and will be released April 27th.