Charging a MacBook Pro via a USB-C monitor

[deckard666]

Which did you get as I am looking at getting a 27" HDR USB C monitor shortly....

 

[3um]

It should be fine. Still, it's also known that some third-party chargers could affect your battery due to some miscommunication between devices. Here's a comment thread on reddit. We can't be sure it's the display's fault, might be just a defective laptop, but still a possibility.

 

[Salazes123]

Interesting topic.
I have a A1989 Macbook Pro 13 Touchbar since mid 2018.
Mostly plugged to a monitor LG27UK850 with usb-c

I did not use the battery so much and the setting to optimize the battery was checked.

Still here is my battery 😢
Design Capacity : 71%
Cycle Count : 342

 

[Yebubbleman]

I took delivery of a 2021 14" MBP earlier this week (loving it) and in preparation I'd also bought a new LG 4k monitor. The monitor has USB-C and when connected 'powers' the MacBook/charges the battery. My question is whether or not this is harmful to the battery - i.e. not using the 67W Apple charger and the battery effectively being at 100% most of the time as a result.

Kind of depends on how much power the monitor gives you. If it gives you 67-Watts, then you're probably fine so long as it's the 8-CPU-Core M1 Pro variant of MacBook Pro (14-inch, 2021). If it gives you 96-Watts, then you're fine for any 14-inch MacBook Pro [or, for that matter, any MacBook Pro (16-inch, 2019) or ANY 13-inch MacBook Pro]. Basically, if the wattage is the same or higher than the power brick that was originally supplied with the Mac, you're fine. And if it's lower, then it will still charge, just slower than your brick would (unless it's really low, in which case you may end up draining power faster than you can replenish).