I have a Voyage. I considered getting the Oasis but fortunately they ran out before I ordered one so I had to wait and while I waited I thought about that battery. The internal battery in the Oasis is 1/6 the size of the battery in the Voyage. The cover provides additional capacity but it only keeps the internal battery charged. The Oasis isn't powered by it.
Since a typical battery is good for between 500 and 1000 charges that internal battery should use up it's lifetime of charges 6 times faster. And that's why I don't have an Oasis.
Actually I think the form factor is pretty nice and if it wasn't for that small battery I would have one.
Barry
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