[tomxor]

same in 2009 model, i'm using it right now, (without OS X of course). there is now a 4-2mm lip on the underside where the battery panel is being pushed out. I still get about 40mins and seems to have stopped swelling so what the heck :P Anyway these days Apple sells those sort of things as "features"... lets call it a "leg gripping lip" allows lap usage at strange angles.

[TheSpiceIsLife]

As a community services announcement: you should probably replace that battery immediately.

It might never burn your house down while you sleep, but someone else might read your comment and think it's okay.

[tomxor]

I most certainly will not.

Shorting, puncture and overcharge cause lipo fires. Expansion can lead to puncture and shorting in stupid thin enclosures, this is in an inch thick unsealed enclosure with lots of give which even pops off with little force, containing a battery which has swollen around 1-2% of it's original volume.

This is not a consumer advice forum, it's hacker news...

[YeGoblynQueenne]

Hey, you probably know that but just in case: charging a swollen battery is a fire hazard.

[tomxor]

It's ok, it swollen to it's current size 8 years ago... and hasn't changed since. It's also not restricted to it's housing because the battery compartment quite easily pops off.

(non-extreme) swelling does not itself cause fire, restriction which leads to puncture or shorting does... this is not a year old 1mm thick smart phone, it's an inch thick decade old macbook.