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I have Samsung Galaxy S3 in the charger 24/7, so it's not good for battery. How can I set charging so that the phone spends battery to say 30% before charging it to full?

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If your device is not rooted, it's not possible

If it's rooted, it's possible but you have to get your hands dirty, since ways below target to cut off battery charging at upper limit and not while discharging to a lower limit , as you want

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