Old thinkpads are the golden standard of Linux compatible laptops, far superior build quality compared to the crap they put out today. Cheap and durable, if a little outdated in specs. TLP is a popular battery management tool that have specific built integration with thinkpads. I managed to snag a couple thinkpads through FB marketplace pre covid for under 200$ each, my daily driver being a t460 made in 2015. i7 quad core processor, 16gb ram, its weakest link is the Intel onboard GPU. The newer thinkpads let you use thunderbolt 3.0 to plug in an external GPU but there’s a trade off between how new a thinkpad is and its build quality. The old ones could be used as body armor plates and probably stop a 50 cal bullet and boot up fine afterwards, the new ones not much