I run an old Compaq laptop without battery. I've seen a dead battery 'swell' and can cause damage. Happened on a Mac. To be honest my laptop is so old the cmos battery is dead and graphics on the way out. First boot goes to a double bleep and to bios. F1 to continue. Goes to a corrupted graphics screen. Force shutdown and it reboots to Win 10 with no more problems lol.
mixed advice when we had a sony laptop left battery in all the time and it lasted just over a year, when we replaced the battery sony said leave out when on mains thats why the first one did not last.
new laptop a samsung the battery is not removable so i rang samsung for advice they said if the battery is never fully charged it will last ok. [they have an option to cut out charging at 80% to prevent battery life].
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