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Still, overall, I'm less enthusiastic about this particular docking station than with the ones on previous Asus tablets. This Vivo Tab RT's docking station retains the extra battery such as Acer AS09B58 battery , Acer AL10A31 battery , Acer AL10B31 battery , Acer Aspire One D260 battery , Acer Aspire 1830 battery , Acer Aspire One 753 battery , Acer AL10D56 battery , Acer Extensa 2400 battery , Acer BATEFL50L6C48 battery , Acer AS09D56 battery , Acer AS09D36 battery , Acer AS09D31 battery inside and the hinged, clamshell design, but it lacks the convenience of an SD Card slot, like the one on the Infinity's dock. On the Infinity, I often used the SD Card slot with my camera's SD Card. I also missed the Infinity dock's larger keys; the Vivo Tab RT's keys are about a 1/16 inch shorter, and that made a big difference in my typing comfort and accuracy. As you'd expect, the keyboard is customized for Windows RT.