[rollcat]

Depends on the actual usage patterns, whether you keep it charged at say 100%, 80%, 40%, etc; its temperature (hot=bad), age, number of charge cycles, technology, how often you actually unplug it, etc - but yes, if you mistreat it, it can get dangerous.

My old 2017 MBP met that fate after mere couple of years, these machines tend to run annoyingly hot (I can hear it right now from the other room - partner is still using it). When it was mine, I kept using it with the lid closed (because the internal screen+keyboard were useless to me). I totally wasn't expecting the battery to suddenly become a spicy pillow! The Apple tech was a little bit scared to touch it, said it's gonna take a while to repair, I guess they can't open this sort of thing on site.

Of course some things changed with M1 (less hot) and later macOS updates (smarter/delayed charging), but the general advice applies to literally any device with a battery.

Some relevant links for Macbook and Thinkpad owners: https://github.com/davidwernhart/AlDente-Charge-Limiter https://www.thinkwiki.org/wiki/tp_smapi