If you were wondering what’s inside a laptop battery, you’re just like me. Fortunately I have an old, defective laptop battery. Just like the show “Mad Labs”, smash labs, and mythbusters, I opened it up and here’s what it looks like.

There are 4 Li-ion cells and at the center is some sort of a charge controller.

The main chip of the laptop battery

This seems to be some sort of temperature monitor which senses the temperature of the cells.

This one, I don’t know. A diode perhaps that senses temperature also?