I found this odd looking 3-terminal device in a laptop battery pack. The board does the charge controlling.
Is this some kind of thermal fuse? It's glued onto these two power FETs. But why 3 terminals for a fuse and not 2?
It's been a long time since I took this picture. I might not have the board any more and I certainly don't have it immediately on hand to do any tests on, sorry.