It’s maybe a bit unobvious (is that a word?), but after activating you have to go into its settings (from the Patchmanager list) and enable it there.
Per default that just applies coloring to the battery icon, so if you want to see mA, you have to enable that too (Show drain)
I have used that patch from 4.4 (on X10iii), C2 (5.1), and J2026 (5.2), so I’m relatively confident that it works.
It’s possible that X10iii needs ‘Xperia BMS’ instead of ‘Default’ for the data source, not sure.
Oh, and if none of your activated patches show any effect, please uninstall and reinstall Patchmanager, that should fix that.
If you still experience problems, maybe continue conversation at Patches by nephros so we don’t offtopic this thread too much.