New details on Nokia’s (NOK) rumored 10.1-inch Windows RT tablet have leaked out from The Verge. The tech blog says Nokia’s tablet will go head-on with Microsoft (MSFT) Surface tablet with its own “keyboard cover” that will also double as an external battery. The 10.1-inch slate will reportedly also have an ARM-based processor of course, a display that is “similar to Microsoft’s Surface RT screen,” two USB ports, HDMI and 10-hour battery life “with fast charging that boosts the battery capacity to 50 percent in a short period of time.” Nokia’s tablet will also have built-in support for cellular data with AT&T (T) cited as a U.S. carrier partner. Nokia is rumored to be planning an unveil at the Mobile World Congress trade show in February 2013.