Removing Di2 Battery from seatpost

I'm going to be switching seat posts soon and wanted to ask the community if there were any tips/tricks to removing the battery. Current setup is standard Shimano friction battery holder....not the lock ring type.

My guess is to carefully use pliers on the tabs to pull and rotate the assembly out from the post. Anyone done this before that could offer any insight? I just want to be prepared when the new seat post arrives.

Not much info using Google other than some people suggesting use of a coat hanger....but they do not explain how it is used, nor can I imagine it being an effective method.

Thanks