battery troubles

Oh.

macbook pro expanded battery (image 1)

Found this in my bag; at some point over the last couple of weeks my spare laptop battery has slowly exploded.  Interesting...  I suppose this is what happens to old lithium-ion batteries.  Itʼs dated late 2007, which makes sense.  So, about six and a half years old.  Is that good or bad?  The previously-mentioned battery in my Powerbook 145b (based on an older lithium compound?) hasnʼt done this.  Itʼs not actually working without mains power either, but it hasnʼt changed shape or leaked or anything.  Last time I looked, the hardwired PRAM Lithium Thionyl Chloride batteries on my Mac IIs were still working after 25 years.  (I havenʼt looked for a couple of years as everythingʼs in boxes, awaiting space.)

macbook pro expanded battery (image 5)

The Macbook battery has been sitting in a bag for about three months since I last charged it.  Has that any bearing on the outcome?  I know little about these.  Anyhow, itʼs clearly not going back in the laptop.  What can you do with a dead battery?  Recycle?  These particular batteries look like they could be re-used as a box to hold memory cards.  But this time, the joints are a bit too far gone.  Perhaps I could get two of the lids – which happily arenʼt coated in glue – and hinge them together.  The currently functoning battery is about three years old and isnʼt holding charge like it used to...

macbook pro expanded battery (image 14)

At any rate, itʼs interesting to see that although expanded, the chargeable content is still securely contained in tough internal bags.  The expanded ones are a bit squishy to the touch.  I assume thereʼs been some evolution of gas.  But safe.  A sort of slow-motion explosion you can touch.

macbook pro expanded battery (image 6)

For once, I am actually pleased with the failure mode of an Apple product. ;-)