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How To Optimize Laptop Battery Life With TLP In Linux - OSTechNix
Linux laptops | Ben's *nix blog
Got my first brand new Thinkpad today and immediately slapped Ubuntu on it, but I'm wondering why the battery life is only like 4h, I have the internal and external battery charged
Lenovo ThinkPad T420 Review - Expert Critique by Itechguides.com
T420 refuses to charge battery all of a sudden? - Thinkpads Forum