Asus VivoTab Smart - Windows 8.1 Preview Battery Problem

Hey Everyone, So, I just tried to install the 8.1 preview on my Asus VivoTab Smart. I installed, did all the system updates, the Intel GMA update, etc. Every device is working perfectly save for one....the battery. The computer doesn't recognize that there is a built in battery (battery driver??). I do a scan for hardware changes in device manager, and it picks it up.....great. Reboot, and it's gone again. Any ideas? And yes, I know it's just a Preview.