Lithium ion and Lithium polymer cells and batteries already have to meet the tests described in the UN Manual of Tests and Criteria, Fifth Revised Edition (ST/SG/AC.10/11/Rev.5 section 38.3 and be <100Wh if they are to be excepted from Dangerous goods shipping. I don't think I have seen any packs with the Wh rating on them but it IS a requirement and has been for some time.
The UN code (UN3480) is the same for both Lithium Polymer and Lithium Ion - there is no distinction between the two.
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