[abawany]

one way to defeat this problem is to connect the charger to a timer plug so that the charger can turn off at night. I use this approach to keep some lesser-used laptops connected and charged (edited) without so far running into the spicy pillow problem.

[boredemployee]

can laptop batteries explode as well in that condition? I have an old lenovo running ubuntu 24/7.

[abawany]

I and an acquaintance got identical Onn i3/4gb laptops (clearanced for 100usd). They left theirs plugged in constantly while I used the mechanism above. Three months later, theirs was suffering from spicy pillow, bad enough to rip the screw holders for the case, while mine is ok so far. I think the mechanism above is reasonable for shady hardware like the Onn laptop but I hope your Lenovo might do better.

[vidyesh]

If fits plugged in and running 24/7 and is old enough most laptops can run without a battery.