@Chiquinho, I said to them the exact same thing and yes I tried different post offices. Even between them there is a confusion. The clerks, showed me a piece of ‘paper’ that need to follow and the restriction there in no Lithium Battery, so I can not blame them. But even them I challenged them and ask about Nickel–cadmium batteries. The said again now, but I am not sure is they understood the difference.
@Logically, do you have a link / source for that? I know that a rule like this is in effect, again I tried to tell them in the post office but again my words were in vain.
Either way, the cost difference from Regular Parcel service to Courier Parcel service was small. Also the due to the Covid situation and the weather conditions, there were no domestic flights to transport my parcel. So Courier service at the end was my only option.
I intent to challenge them again once I have something with battery to sent.
FYI I live in Cyprus.