Author Topic: Strange component in a laptop battery (Read 4167 times)

rexxar · « **on:** July 06, 2014, 03:58:37 am »

I had just opened an old netbook battery to rip out the cells when I saw something weird. My first thought was that it was some sort of FET without a plastic case. I guess it could be a temperature cutout, since it's glued on top of two MOSFETs (with actual cases), but it's got three legs?

rs20 · « **Reply #1 on:** July 06, 2014, 04:01:10 am »

Wow, that's an awesome-looking component! Thermometer sounds like a reasonable guess; thermometers can have three legs. I'm sure someone else has a more definite idea of what this is, though.

mij59 · « **Reply #2 on:** July 06, 2014, 04:22:54 am »

It could be the controller chip.

peter.mitchell · « **Reply #3 on:** July 06, 2014, 04:42:05 am »

my money is on a fuse. either single element with heater or dual element.

Rerouter · « **Reply #4 on:** July 06, 2014, 04:43:53 am »

If your referring to the device with the orange spot, it is the sensor for the coulomb counter chip mounted beneath it (high current bidirectional shunt)