General > General Technical Chat

"Corroded" blister pack of lithum cells - what's going on?

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tom66:
This is a weird effect - found this pack of CR2016's in one of my old stores of batteries. The whole pack is "corroded" though there's no obvious leakage from the cells.  Most other cardboard/plastic blister packs of a similar age in the box are fine, but a few others are like this, and they all contain lithium cells.

The cells from at least one pack seemed to test okay at 3V, and the cells are still theoretically "in date".

Anyone know what is going on here?

AVGresponding:
I would suggest they have been stored somewhere that is either damp or at least regularly so, and the "corrosion" is simply the cardboard breaking down.

tom66:

--- Quote from: AVGresponding on August 14, 2023, 04:24:09 pm ---I would suggest they have been stored somewhere that is either damp or at least regularly so, and the "corrosion" is simply the cardboard breaking down.

--- End quote ---

I thought the same at first, but there are cardboard blisters in the box that have not broken down (some Alkaline AA's I grabbed from the local Maplin's before they popped, over 5 years old) - so I had ruled it out as a possibility. I suppose it's not impossible that the cardboard on these cell packs is 'weaker' than the others but it's a peculiar coincidence that only the lithium coin cells have been impacted.

PwrElectronics:
First glance it looked like it got damp and had mold on it.  If not, no idea.

u666sa:
They leak gas, then. And it has effect on cardboard box. I think it's a throw out material.

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