Hmm, interesting. I was not aware of this but I have never had any trouble with this.

I did a little searching and found this however: https://www.shipito.com/shipping-lithium-batteries-from-usa
There are some postal services that will ship batteries without questions, such as FedEx and DHL.

Just want to reiterate, I never had any problems with this and this is the first time I'm hearing of it.
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If you're shipping lithium batteries from the US try www.viabox.com for package forwarding. They have multiple carriers, including FedEx and DHL.