Usually, charging your phone overnight is not dangerous with a modern phone and a good charger. The bigger concern is long term battery health, not an instant disaster.
Is it bad to charge your phone overnight?
TL;DR
Usually no. Overnight charging is generally fine, but heat is bad for battery health.
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Modern phones manage charging once the battery is full. That means the phone is not simply forcing power into the battery all night.
Still, batteries age faster with heat and constant time near full charge. Keeping the phone cool helps more than obsessing over the exact percentage.
Use a quality charger, avoid covering the phone with blankets, and turn on optimized charging if your phone offers it.
Overnight charging is normal. Just avoid cheap chargers and heat.
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