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Mitsubishi has a procedure for the MiEV pack which involves placing it in a wooden crate lined with a heavy plastic film, then filling this "tub" with water, and waiting 72 hours.

Basically you could put it on a sheet of plastic film on top of a pallet, then carefully build some side walls without puncturing the film, to make a tub.

i don't know if this will help with disposal, but it should remove any concerns over transporting a hot pack that has voltage.

edit: no salt in the water, just tap water. Salt causes the reaction to be too aggressive and release excessive hydrogen gas. Water makes it react, salt water reacts too fast.
 

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Add salt to make the water more conductive. Since you are testing individual cell modules by themselves it may require a more agressive method.

The miev pack has numerous circuit boards and connections to each cell that provide easy-to-short conduction paths when they get wet. Your cell terminals are well separated and have no circuit components. Here is an 8 cell module from the miev.
 

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