Yes, you can charge your phone overnight. Modern smartphones use smart charging technology. This technology stops charging once the battery reaches 100%. The charger only provides a trickle charge to maintain the 100% level, preventing overcharging. This is confirmed by multiple sources, including Samsung's official support page which explicitly states: "Your phone's battery will not be at risk of overcharging if you leave it plugged in overnight." ^1 Many other online forums and articles reiterate this point. [^2, ^3, ^4, ^5, ^6, ^7, ^8, ^9, ^10]
While some sources suggest charging to 80% and unplugging for optimal battery health, this is a recommendation for maximizing long-term battery lifespan, not a necessity to prevent damage. ^3 Leaving your phone plugged in overnight won't harm the battery in the short-term or even the medium term. The impact on overall battery life over many years may be minimal. The phone's built-in charging controller manages this effectively. [^2, ^10]
Concerns about heat generation from trickle charging are generally considered minor and unlikely to cause significant damage. ^6 The benefits of convenient overnight charging generally outweigh the minor potential risks for most users.
[^7]: Apple Community. (2023, February 24). Should I charge overnight with 60% batter… Retrieved from https://discussions.apple.com/thread/254664504
[^9]: OnePlus Community. (n.d.). [CLOSED]Accidentally charged my phone overnight. Retrieved from https://community.oneplus.com/thread/656187
