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Microsoft will begin shipping its battery-life-extending Power Covers for its Surface devices starting March 19 for $199.99.



From All About Microsoft:
The disclosure of the date ocurred on March 10, which is when Microsoft went live with pre-orders for the covers that extend the battery life of Microsoft's Surface Pro, Surface 2 and Surface Pro 2 tablets. (I saw the pre-order page on the Microsoft Store thanks to a tweet from that account.)

The Microsoft Store pre-order page claims the Power Covers -- Type covers with extra battery support -- will extend battery life by up to 70 percent. (Microsoft officials were promising battery-life extension of up to 50 percent from the new covers last year.)

The Power Covers weigh .55 pounds and are 9.75 mm thick. They don't have back-lit keys, unlike the new Surface Type 2 and Touch 2 covers. They will retail for $199.99.
  Microsoft Surface Power Covers get a mid-March ship date