Charging IPhone 12 Pro Max overnight with fast charging
Is it ok to leave my iPhone charging over night with the 20W official power brick by Apple?
iPhone 12 Pro Max
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Totally fine! You could even let it charging with a MBP 96W power brick.
The iPhone logic board alongside iOS will take care of smart charging the iPhone. It'll stop drawing power once fully charged. There's also the Battery Heath feature in iOS that'll slow down the charging when it is close to full, controlling the energy for a slow charge, helping preserve the battery.
Some more about it iPhone Battery and Performance - Apple Support
