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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Sustainability
Policies, Procedures, and Forms Updates
Simple Postage - shipping or flying with lithium batteries
Amazon.com: EZ on the Earth Battery Recycling Container Kit, 1 Gallon Battery Recycling Pail, pre-Paid Mail Back Recycle kit for Lithium Batteries and Other Dry Cell Batteries : Home & Kitchen
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Send them back | USPS News Link
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Shipping lithium battery devices or other hazmat via USPS? These new rules are effective immediately. - Labelmaster Blog
Not-acceptable
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Surface Mail Only Lithium Metal Batteries Label, SKU: LB-4007