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I just discovered (from an Android app called AccuBattery) that fully charging a lithium ion battery is significantly harder on it than charging it to only 80% or less. Most of my devices use lithium ion batteries, and most of the time (especially Windows laptops) I leave them plugged in because I'm at home or at work where power is readily available. I'm wondering if this is hard on them, and, if so, why utilities have not arisen to limit the charge to around 50% when the user knows they're not planning to need battery power for a long time. Is maintaining a 100% charge all the time damaging? Is there a balance regarding the frequency at which charging from 50% to 100% and using the battery back down to 50% breaks even with maintaining 100% charge and using it down to 50% at the same frequency?
I don't understand how partially charging a battery can result in reduced capacity and fully charging a battery can also result in reduced capacity. What's a person to do? My Nexus 6P battery capacity is down to 25% of its original capacity, possibly because I kept it fully charged most of the time (though there may have been other hardware issues with this phone) so I'm trying to better understand battery maintenance in general so I know what to do after I get it back from warranty service replacing the battery. – BlueMonkMN – 2017-08-30T12:46:39.897
1The issue is regularly partially charging a battery. Rechargeable batteries wear out eventually regardless (think about any times you've had to replace your car battery for example), it's just a matter of how and when. Some are designed to be kept charged at full capacity most of the time (like car batteries, because you need a significant discharge to start the car), others are designed to gracefully handle regular partial charges (like a lot of phone batteries). There's really no way to know as a consumer though which is the case for a particular battery. – Austin Hemmelgarn – 2017-08-30T12:59:17.193
1To give slightly more concrete advice for your particular case, charge your phone when it needs to be charged, don't just leave it on the charger all the time. Most phones are designed to run throughout the day and be charged overnight. – Austin Hemmelgarn – 2017-08-30T13:00:26.580
For what it's worth, the manufacturer, Huawei, gave me similar advice after repairing the device (Nexus 6P had issues anyway) and replacing the battery. They went a step farther and suggested plugging it in in the early morning so as not to ever leave it plugged in while fully charged. – BlueMonkMN – 2017-09-21T23:30:55.870