is fast charging using 20watt charger bad for the iphone 13 battery health? or should i use the 5watt charger for better battery life because it’s produce less heat than the 20watt charger?
iPhone 13 Pro Max, iOS 15
The 20 watt charger (or more correctly power source) is not bad for the battery, because the actual “charger” is in the phone, and it monitors the temperature in the phone to keep it within safe limits. And it will stop charging at 80% to allow the phone to cool down, then resume at a lower charge rate once the temperature has stabilized.
However, there is nothing wrong with using a 5 or 12 watt USB-A charger, and, if you charge overnight (as you should) there is no need to use a fast charger. The absolute best way to get maximum use on a charge, as well as slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates.
The 20 watt charger (or more correctly power source) is not bad for the battery, because the actual “charger” is in the phone, and it monitors the temperature in the phone to keep it within safe limits. And it will stop charging at 80% to allow the phone to cool down, then resume at a lower charge rate once the temperature has stabilized.
However, there is nothing wrong with using a 5 or 12 watt USB-A charger, and, if you charge overnight (as you should) there is no need to use a fast charger. The absolute best way to get maximum use on a charge, as well as slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates.
No. Its not bad. The iPhone can manage its charging and will not overcharge.
The 5 watt charger will not harm the iPhone but will be very slow to charge it, and may even lose charge if you are using the phone while charging.
Use an 18 or 20watt charger as recommended by Apple. Link-> Fast charge your iPhone - Apple Support
Theoretically, maybe. But it's allowed and probably of such little effect that the convenience of charging faster outweighs minor increase in battery health decline. Apple's nominal longevity rating (500 cycles to 80% battery health) is just a ballpark figure. Some do better and some do worse. But it factors in all the variables including the use of the fastest charging. If it was that critical, I don't think Apple would allow it, or would at least give the user an option to change the battery management settings to limit the charge current.
No.
is fast charging harmfull for the iphone battery?
