By the way, Microsoft Surface Pro battery replacement at (yikes!) $470.
http://www.winbeta.org/news/surface-pro-battery-replacement-will-cost-you-nearly-470-other-components-just-pricey
$59.75 here http://www.ebay.com/itm/NEW-Genuine-Original-Samsung-5500mAh-Battery-for-Microsoft-Surface-Pro-1-2-/221798913272?hash=item33a43ed4f8:g:32MAAOSwgyxWVK7j
i bet the SurfaceBook is even worse. I read it was a nightmare to disassemble.