Reasons for swollen battery?

Replaced my old battery with one from ifixit about 2 years ago. Trackpad clicker stopped working and realised that it was due to a swollen battery. However, the battery status shows normal as well as it charges and functions normally. I always remove the power after my battery has been charged fully, so there is no chance of overcharging/overheating. May I know the reasons for swelling? Could it be due to the battery being of a 3rd party product?

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Apple battery packs contain a set of 6 lithium Ion (Li-Ion) cells (the metal covered envelopes), connectivity circuitry, and a small logic board.

The main cause for battery cell swelling is what is known as thermal runaway.

If a cell reaches a certain temperature then a chemical in the cell (usually Cobalt Oxide for Lithium Ion batteries) starts an unintended reaction which is exothermic in nature (i.e. it creates heat). More heat raises the cell temparature further which causes more of the same chemical reaction

This creates a runaway thermal overload which can end in one of two ways, the cell and therfore the battery pack, catches fire or the reaction fizzles out with the cell in a swollen state.

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Being 3rd party could definitely be an issue.

I would look into getting a new one as it is now a fire hazard.

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Divesh will be eternally grateful.
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