10-14 years ago my Dell laptops had removable battery. I did not use it to ensure anything (hibernation worked perfectly for me these days), but I would carry w

10-14 years ago my Dell laptops had removable battery. I did not use it to ensure anything (hibernation worked perfectly for me these days), but I would carry with me a spare fully-charged battery. Two batteries usually were enough for a cross-Atlantic trip, which was a frequent feature of my life.