for long compilations I take off the battery from the laptop to preverve it as I consider it a "consumable".

Another "consumable" I discovered in my thinkpad is the fan. Just broke the second in one year, maybe I've been just unlucky with the second.

But old thinkpad are unbeatable beasts and I can replace the fan with 5-10€, a common screwdriver and 10 minutes of my time.