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How to set battery charging thresholds on T420s

I have a ThinkPad T420s and would like to expand the battery service life (not maximize time the laptop can run off a battery) I have tp-smapi-dkms and sysfsutils installed, and when I run: $ ll ...
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Where do I get linux-headers-3.0.0 for 12.04

I'm pretty new to Ubuntu, so question may seem stupid. I have a module which used to work on my parents laptop. After several updates module no longer works, and I'm pretty sure, old kernel would ...
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How do I load the tp_smapi kernel module on a Lenovo Easypad?

I own a Lenovo EasyPad Z580 running Ubuntu and I'd like to manage more of the power management (battery). I found answers in this question about battery management on Lenovo systems: How can I limit ...