I was told not long back that batteries could only be posted if they were new, unused and in original packaging. While used batteries have to be posted with the item they were designed to be used in.
UPS and MyHermes wouldn't courier them as they were not new and unopened.
I did however send some through the post office before Christmas after being creative with the items description when in the post office. I have also however heard of occasions when the package has been destroyed as the item has been detected restricted/prohibited items.
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