Panasonic Toughbook's battery pack. On the board is a ATMega163L,
That's actually an interesting application for a mcu. If the toughbook were mass-produced, Panasonic would have gotten a asic or epoxy-packged ic there for that application - the small production scale for the toughbook doesn't allow that.
The mcu is used there for its flexibility and such a high cost solution (vs. asic etc.) becomes a (relatively) low cost solution for this particular application.