The ridge on the back of the Kindle Oasis isn't just a handgrip – it houses the ereader’s chunky battery, so you can expect the device to last a long time. The Amazon Kindle Oasis with its hand-hold ridge (Image credit: TechRadar) This isn’t quite a scientific or empirical way of measuring the battery life of either device, but without specs it’s the closest we can do – and the winner is pretty clear. While we don’t have exact battery sizes for the Amazon Kindle Paperwhite or Oasis, during the course of our review we made a few estimations based on how long they lasted and how quickly the battery dropped. The Kindle Oasis has the superior design and display over the Paperwhite, and this makes it a better device for certain audiences, like people who constantly bash or drop their device, or have sensitive eyes, but the design improvements might not be necessary for all users. The Oasis really shines (pun intended) through its range of extra display options, like a high max brightness and an optional orange ‘warm light’ intended to reduce eye strain when reading. In terms of screens, the Paperwhite has a 6-inch display, which is short of the Oasis’ 7-inch screen but both have the same 300 pixel-per-inch resolution. For its premium price tag you get a range of other improvements on the Paperwhite, like the metal body and physical buttons to help you navigate pages quickly. The Amazon Kindle Oasis has a far more intriguing design: on the back of the body is a large ridge that offers a natural hand-hold to make the ereader easy to grip in a range of situations (like walking, or laying on your back).

Amazon Kindle Paperwhite (Image credit: Future)

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