Thinkpad T60 from 2007. Even the 9 cell battery is still "fine" with about 70% of its maximum capacity left. I recently upgraded to the T440s/T450s generation,

Thinkpad T60 from 2007. Even the 9 cell battery is still "fine" with about 70% of its maximum capacity left. I recently upgraded to the T440s/T450s generation, but the T60 is still working (though the display backlight is really dim meanwhile).