Actually, a lot of this comes down to the hazardous materials regulations and the postal service trying to tighten up its procedures along those lines. It is fine to send hazardous materials via air provided it conforms to the hazmat regulations and this includes the shipper knowing that the package is classified as hazmat. What you may find is that the postal service is not licensed as a hazmat shipper and therefore, can't (or shouldn't) ship something that is classed as a hazardous material ie lithium ion batteries. FedEx, DHL, TNT etc. are all licensed to carry lots of different hazmat therefore, they have no problem sending lithium ion batteries. What I can suggest is see if the Italian post's EMS service also restricts lithium ion batteries. They may have the EMS service handled by another shipper which might be licensed to carry lithium ion batteries. You could also try other third tier courier companies as they would probably have no issue with lithium ion batteries but also be cheaper than the top tier ones (FedEx, DHL, etc.)
Personally, I'd go with DomesticExtremis' suggestion and try a different post office.
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