Nokia Lumia 2520 is a nice Windows tablet, but if you want laptop-like typing experience or longer battery life, you may need other accessories such as the Nokia Power Keyboard with backup battery.
Nokia Power Keyboard is an official accessory designed for Nokia Lumia 2520 Windows 8 tablet. The multi functional keyboard cover measures 6.97 x 10.59 x 1.02 inches, weights 20.14 oz, and as we can see from the images, the keyboard cover features a full QWERTY keyboard with a touchpad in order to provide a comfortable typing and control experience, while built-in backup battery offers up to 5 hours of extra battery life for the Windows tablet, moreover, the keyboard cover comes with two USB ports so you can connect two USB devices with your Lumia 2520 at the same time, and its durable design protects the Windows tablet from bumps and scratches.
Nokia Power Keyboard with backup battery is priced at $149.99 USD. If you’re interested, jump to Verizon Wireless or AT&T for more details.