I posted this as a reply to a certain someone spreading false information but I see many people have this misconception that it is bad to leave your phone plugged in because it will "overcharge" or "explode" or "catch on fire" or something..... Some say "oh but battery widget reads 4.2v or 4.3v that is bad...." Here are the FACTS:
1) New battery chemistry in modern phones is not 3.7 nominal volts and 4.2 volts charged. Instead it is 3.85v nominal and 4.35v charged. (For example in my galaxy note 4)
2) Google CC/CV charge curves. When the battery is low, initial phase is high current but the curve changes once the battery hits a certain voltage and the charging current gradually drops until it hits 0 at full charge.
3) Protection circuits monitor voltage, charge and discharge currents as well as battery temperature. Leaving your phone plugged in will not let the current or voltage exceed rated specs due to charging / protection circuitry in the phone and battery.
4) Always keeping your battery below 100% (like say 90) will have negligible effects on increasing battery lifespan (and by then you will have replaced your phone long ago).
So basically it is perfectly fine to leave your phone plugged in to the charger like you do with a laptop.
Source: Research, experience with Hobby grade Li-Ion and Li-Po batteries/chargers.
Galaxy nexus, Galaxy Note 2, Galaxy Note 4 all left overnight with zero issues and no noticible battery degradation.
1) New battery chemistry in modern phones is not 3.7 nominal volts and 4.2 volts charged. Instead it is 3.85v nominal and 4.35v charged. (For example in my galaxy note 4)
2) Google CC/CV charge curves. When the battery is low, initial phase is high current but the curve changes once the battery hits a certain voltage and the charging current gradually drops until it hits 0 at full charge.
3) Protection circuits monitor voltage, charge and discharge currents as well as battery temperature. Leaving your phone plugged in will not let the current or voltage exceed rated specs due to charging / protection circuitry in the phone and battery.
4) Always keeping your battery below 100% (like say 90) will have negligible effects on increasing battery lifespan (and by then you will have replaced your phone long ago).
So basically it is perfectly fine to leave your phone plugged in to the charger like you do with a laptop.
Source: Research, experience with Hobby grade Li-Ion and Li-Po batteries/chargers.
Galaxy nexus, Galaxy Note 2, Galaxy Note 4 all left overnight with zero issues and no noticible battery degradation.