For some reason, Mint doesn’t provide access to the power profiles out of the box… no idea why. I just install a Cinnamon applet called “Power Profiles” and it gives me the same systray switcher as Fedora.

Fresh install of Mint was giving me about 2 hours battery life. By switching to Power Saver profile, I can get up to about 6-8 hours. I mostly only need to go to Balanced or Performance when gaming.