OK, so mediaserver was killing my battery too. I did some digging with the digging being geared towards media and serving information. Turns out, for me anyway, that the Google play store was using twice the amount if background data as it was foreground data so, I checked the box to restrict background data and vioala!!!! Mediaserver went from using over forty percent to, now, 3 percent. I've been on battery all day from 8am, it's eleven now and I'm at 81 percent writing this.