[Q] OG Battery mod for 4.4.2 topic

I've been doing some research and I don't know if its possible to get OG battery mod on any 4.4.2 rom. I assumed this was not possible yet but I am starting to see new roms with it included. Is this custom work by the devs or is this something that can be added by the user. I understand that the battery is hardcoded now so it can't be as easy as it was for a non-dev to trial an error. I like kitkat but the battery is sooooo bland with xposed options or stock.