Unable to Turn off Battery Percentage Indicator
I'm guessing that if you're "several versions of phone and iOS beyond where" you were when you did this, then you are likely not jailbroken anymore? Because they introduced the percentage as an option and is configurable in 
Settings >> General >> Usage >> Battery Percentage (last option for me).

If you're still jailbroken and you have this option off already, then I'm sorry, I can't help you there. Good luck