Battery Optimization
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Go to settings, click on App

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Click on app, which you want to run in background

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Now Click on battery

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Click on battery optimization and click on do not optimize

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Click on more settings

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Click on manage battery

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Click on Power management

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click on Setting icon

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Now"Off" smart sleep power saving

Auto Launch Setting
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Click on System manager

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Click on app manager

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Click on App auto-launch

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Click on app

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Click on settings

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Click on whitelist

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Click on Add to whitelist

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Click on add app

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