I checked the patch notes recently on the new Tide Turner, and according to the notes, shield bash kills are now supposed to recharge your meter as well as kills from the critical hit with your sword.
Except I've noticed that I've gotten kills with Nessie's Nine-Iron and my shield equipped, yet haven't had my charge meter filled by the kill.
Whether or not the charge meter actually charges back up seems inconsistent, though maybe it's just my inconsistent 'sword' swinging that's messing me up.
So, for the record, what type of kill under what conditions must you get with the Tide Turner equipped in order to get a fully recharged charge meter?