I've been curious about something: when my phone is charging at around 50%, both the phone and the fast charger get pretty hot. But once the phone reaches 100%, they go back to being cool. Is there a reason for this? I've heard that keeping the phone plugged in at 100% isn't good because it can damage the battery over time. If the charger is cool at 100%, does that mean it's not supplying power anymore? I usually don't leave it plugged in for long after it's fully charged, but I find this change in temperature interesting. I've noticed similar behavior with other phones and their chargers too.
4 Answers
The reason your phone and charger heat up at 50% is due to the charging speed. At 100%, charging stops, so they cool off. It’s a pretty normal process!
It’s pretty common for devices like phones, laptops, and electric cars to charge fastest between 20% and 80%. Since charging slows down significantly outside this range to protect the battery, that’s when you’ll see the heat drop too. More power means more heat during fast charging!
Exactly! Once the battery is full, charging ceases. This happens with phones, laptops, and even older devices. The whole idea that it’s harmful to leave a phone plugged in when it’s charged is more of a myth. Your phone still uses power from the charger, but it’s a trickle compared to charging. Nothing to worry about really!
When your phone is at around 50%, the fast charger pumps in more current to get the battery charged quickly, which generates heat. As the battery nears full, the charger slows down to finish off the cycle, making both the charger and phone cool off at 100%.
Understood! Thanks for breaking that down.
Got it! That makes total sense, thanks!