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Endurance is an app that helps your Mac run longer. Endurance runs in the background and when your battery level drops to a certain level, it automatically starts adjusting your settings and turning off features which use a lot of energy. The tests have shown that it can give you about 20% more runtime, which you can spend writing, browsing the web and watching movies. Your big shiny screen takes a ton of electricity to run. Endurance can slowly dim it over time, but like a frog in boiling water, you won't even notice.