RS41 radiosondes with lithium batteries are classified as:
- UN 3091 Lithium metal batteries contained in equipment
Consignments must be packed, labeled, and documented according to the IATA packing instructions.
When transporting the radiosondes with lithium batteries, take the following requirements into account:
- The package must display a lithium battery handling label, similar to the one shown in the following example. The original radiosonde shipping package must be used for transport, and it already has the lithium battery handling label.
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The consignment must include a document indicating the lithium content, describing proper handling and procedures for damaged packages, and a telephone number for additional information.
Figure 1. Lithium battery handling label 
If the lithium battery is faulty, do not transport it.