This is the Voodoo Battery kext that enables the Battery meter & percentage for almost all laptops running on OSX Mavericks 10.9.x
Use this if you either lost battery percentage upgrading from a previous version of OSX or if you have no battery percentage at all.
This package contains two kexts. Install both of them manually or with a kext installer of your preference.
1) Voodoo Battery
After install if battery meter doesn't show up, go to Settings > Energy Saver > Enable Show battery status in menubar
By the Voodoo Labs