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.
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Post-lithium-ion battery cell production and its compatibility with lithium- ion cell production infrastructure | Nature Energy
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Shipping lithium battery devices or other hazmat via USPS? These new rules are effective immediately. - Labelmaster Blog
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Surviving in Japan: (without much Japanese): Japan Post to Ship Electronics with Lithium Ion Batteries Starting 2013
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