تويتر \ Royal Mail Help على تويتر: "@modelsbc Hi Stephanie, I'm very sorry, the letter states the item contained items classed as dangerous goods. Please call the number at the bottom of
How to send lithium-ion batteries through the post with the Royal Mail. There are tough rules to follow and here they are written simply.
![Postage Battery Warning Label (UK) - UN3091/UN3481 - Domestic Mail : Free Download, Borrow, and Streaming : Internet Archive Postage Battery Warning Label (UK) - UN3091/UN3481 - Domestic Mail : Free Download, Borrow, and Streaming : Internet Archive](https://archive.org/download/Battery-Warning-UK-Dom-Mail/Royal%20Mail%20-%20UN3091%20UN3481%20Battery%20Warning%20PO%20Label%20-%202020-05.jpg)