After turning on the Optimized battery use, you can automatically optimize the background applications that consume too much power to extend the battery life.
Setting method:
realme UI 3.0 & above versions: Settings > Battery > Advanced/More settings > Optimized battery use
realme UI 2.0: Settings > Battery > More battery settings > Optimized battery use
realme UI S & T & R & Go Edition: Settings > Battery > App standby optimizer
realme UI 1.0: Not supported
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