I'm curious to know if anyone here has tried opening a dead laptop battery and replacing the Li-Ion cells inside. Technically it should be as easy as wiring up Li-Ion batteries for a portable, except that you'd re-use the protection circuit from the laptop battery.
The reason I ask is because the battery in my Macbook Pro is not lasting as long as it did. It's far from dead, but I'd like to be able to go longer than 2 hours while trying to squeeze out as much time as possible (minimum brightness, not watching videos, all of that typical battery-life-extending stuff). I'm currently at 450 charge cycles and 3800mah charge capacity left, so I've gotten plenty of use out of it. Many websites say it's a 6-cell battery, but that doesn't add up. It's 10.8v, which means 3x3.7v. Also, it's 5400mah, and supposedly uses 1800mah cells, so 3x1800mah. That would be 9 cells...
The other thing I'm curious about is what type of cells are inside. The battery pack is pretty thin, 14mm including the outer case. A typical cylindrical AA-size Li-Ion battery is 14mm thick, so it wouldn't fit. It's probably flat-packs. But I don't see anything on batteryspace that seems like it would fit.