Using Battery saver above 85. Does not harm you're device instead you're phone will turn into slow usage. To save you're battery that's why but it's okay tho. 😄
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There isn't any harm to the device by leaving it on power saving mode all the time. It will though cause notifications, email, and any instant messages along with updates to be hindered. When you turn on power saving mode only the essential apps to run the device are on like for calling for example.
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