I can't find it now. I thought it was in the Thundersky Instruction Manual (2007030222 seems to be in the name of the PDF file). But when I read page 37 of that document, it seems to say that swelling should not happen in normal use.Where did you read manufacturers saying this?
I'm talking about slight swelling, a few millimeters of extra width, which gentle clamping will fix. A post that seems to agree that gentle clamping is good for cells:
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