My Panasonic Toughbook CF-29 from around 2004, still works great with Linux and the (I believe original) battery still lasts 3-4 hours. : r/BuyItForLife
Amazon.com: Panasonic Toughbook CF-C2 12.5 Inch Laptop , Intel Core i5 4300U up to 2.9GHz, 4G DDR3L, 240G SSD, WiFi, USB 3.0, VGA, HDMI, Windows 10 64 Bit-Multi-Language, English/Spanish/French(CI5)(Renewed) : Electronics