How Long Does It Take To Charge A Phone Battery. Take the USB-C to Lightning cable you received with your new iPhone. Even a phone in a sleeping state uses battery.

The USBCharging Port is at the bottom of the phone. However if it was left powered on and near discharged permanent damage may have been done to the battery. Charging current for 120Ah Battery 120 Ah x 10100 12 Amperes.
You are way way over-thinking this.
To extend the lifespan of your battery if the battery gets too warm software might limit charging above 80 percent. To extend the lifespan of your battery if the battery gets too warm software might limit charging above 80 percent. However if it was left powered on and near discharged permanent damage may have been done to the battery. With the correct charger a smartphone with a high capacity battery should take 2 to 3 hours if you are using a lower power charger it can take up 6 hours before you buy a fast charger make sure the phone is QC3 charging or similar as you may be wasting money.
