What causes battery to puff up and lose capacity?
Battery in my three year old became to lose capacity but after almost 400 cycles it didn't cause any concern to me. However soon it start to puff up in the middle - it increased it's hight considerably even trackpad stopped working from excess pressure.
Then I thought It was failure of used battery so I bought new one. Unfortunately after one month of using new one it's capacity reported by system decrease to less the half and it started to puff up again.
What can cause this behavior?
Will replacing left I/O, MagSafe board be sufficient?
Thank You for Your suggestions.
Is this a good question?