Fix Your Stuff Community Store

Released June 2009 / 2.53 GHz Core 2 Duo Processor

170 Questions View all

Options

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?

Answered! View the answer I have this problem too

Is this a good question?

Yes No
Score 0
Add a comment

2 Answers

Filter by:
Most Helpful Newest Oldest
Chosen Solution

Options

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.

Was this answer helpful?

Yes No
Score 1
Add a comment
Most Helpful Answer

Options

Being 3rd party could definitely be an issue.

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

Was this answer helpful?

Yes No
Score 1
Add a comment

Add your answer

Divesh will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 0

Past 30 Days: 1

All Time: 1,715