I remember, and I’m gen z. And some higher end laptops had two battery slots so you can hot swap the batteries without turning it off.
Those were the days. Everyone talks about how smartphones nowadays get people addicted to instant gratification and convenience, but IMO the ability to swap out the battery when it died was a level of instant convenience we had decades ago that modern devices are severely lacking. Having to tether your phone to a battery bank while on the go is nowhere near as good as just popping the back cover and replacing the battery.
my last phone with a replaceable battery was a motorola smartphone with android. i had two batteries i swapped out when the other discharged, it was great.
but no, we have to have disposable planned obsolescence phones that can’t do what they used to anymore a couple years from now.