I have found that overcharging your battery is what causes the poor battery performance. Only charging from 20-80 does not over charge. It means not plugging your phone in when you go to bed, rather charging a couple times during the day when you can monitor.
AccuBattery is great for sounding an alarm when it reaches the desired charge level. As you say this is a great way to extend battery life. Charging 100% is effectively overcharging, pushing the battery to its absolute limits.
Yep, that is what I use as well.
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