Why Phone Charging Slows as the Battery Fills
Why Phone Charging Slows as the Battery Fills
The battery controller changes the current as it approaches its voltage and temperature limits.
A charger can deliver higher power during part of the session when conditions allow. As charge increases, the controller may reduce current to keep the cell within its operating limits.
Charging while playing a demanding game or leaving the phone in a hot room can cause an earlier reduction. The adapter's printed rating therefore describes a limit, not the whole session.
Record the time to add the amount of charge you use on a normal day. The last part of a full charge can take much longer per percentage point than the first.
