I want to use the monitor's Thunderbolt/USB-C port to charge my MacBook. Will connecting both a power adapter and a monitor via Thunderbolt/USB-C to a MacBook cause overcharging or damage?

01-24-2025

No, it won’t.

MacBooks are equipped with an intelligent Power Delivery Management system that detects and manages multiple power sources. When both a power adapter and a monitor are connected, the system automatically prioritizes the most stable source and stops charging from the other, preventing overcharging or damage.
BenQ monitors, which are Intel-certified and compliant with USB-C Power Delivery protocols, ensure safe and reliable power management. We provide the appropriate voltage and current based on your device's requirements, with protections such as over-voltage and over-current safeguards.
Moreover, BenQ’s certified monitors are specifically designed for Mac devices, offering secure USB-C power delivery and optimized display performance.
Tips for Extending MacBook Battery Life:

(1) Turn on the MacBook "Optimized Charging" function.

(2) Use original or certified Thunderbolt/USB-C cable and power cord. It is recommended to choose certified (such as Apple MFi-certified or USB-IF-certified) devices and accessories. Using a non-original or low-quality power cord may cause the monitor to result in unstable voltage input. , this is the source of risk of damaging the equipment.

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I want to use the monitor's Thunderbolt/USB-C port to charge my MacBook. Will connecting both a power adapter and a monitor via Thunderbolt/USB-C to a MacBook cause overcharging or damage?