Hello.
Bought on Aliexpress Power Bank, Power Bank broke almost immediately, opened a dispute, Aliexpress made a decision - "return of goods and money."
Now I need to send Power Bank back to China.

I was told that it is impossible to send lithium batteries and goods with the battery inside to China at all.
If lithium batteries are found during mail processing, the item will be returned and the sender will not be eligible for a refund of postage. The sender may also be held liable.

Is it true there is such a law in China?

How can I convince Aliexpress that I can not send Power Bank to China ?
Can you give me a link to the law or the rules of the Mail of China, which says that the battery can not be sent to China?