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How to tell if venting has occured

Wolf72

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Joined
Aug 3, 2021
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Hello all, I am wondering how you tell if a prismatic catL cell has previously vented. Does the foil break, does the blue bubble break, both? Is there evidence? I assume once you have evidence of venting you should discard the cell, is that correct? Thanks David
 
Following. Apparently there will be like a chemical smell once the seal has popped.
 
The Ones I have seen break the foil and when they do there was a pretty good popping noise.
 
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