If you haven't already, borrow the battery life improvements that were added to fedora 28.
https://fedoraproject.org//wiki/Changes/ImprovedLaptopBatteryLife
https://www.youtube.com/watch?time_continue=4&v=mypteFGjwH4&feature=emb_logo
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This isn't really a package request, since AFAIK all of the Fedora battery life changes are kernel config changes
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Most of the changes he made are kernel patches that were long since merged. The rest look like ones we specifically had to disable because of the hardware issues they cause.