Try this
http://xdaforums.com/google-nexus-5/themes-apps/app-enable-battery-percentage-android-4-t2516913
Its not exactly on side but will show the battery% on 4.4.4
I need a Flashable Zip to get it like the one on the pic
just battery% near the clock for XT1033
it was working on 4.4.2 but I didn't find one for 4.4.4