Puff

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The behavior exhibited by a Lithium Polymer cell or pack that has been overcharged, over-discharged, abused, or has just decided it's done working and wants to die. The cells start to produce gas, and since the electrolyte is a polymer, it can't re-absorb this gas. The cells are contained within a pliable metal foil packet rather than a rigid can, and thus the gas pressure inside causes them to swell up, or puff.

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