I have a 2019 MacBook Pro with Mac OS Big Sur. I use an external display with a MagSafe power connector, so I was looking for a way to use it to power my USB-C-only MacBook. Basically it works. The communication is fine. The loading speed is slow. Sometimes it will only charge at the rate the system is using, causing the battery to charge very slowly. It gets pretty hot at times. But I would still call it usable. (Although the charger once couldn't keep up with the power consumption of the video conference, I had to switch to a real charger to keep the system from dying.) The main problem is that the operating system seems to have the ability to avoid overcharging, with which this connection does not work well. When the system is almost fully charged, it will stop drawing power from the power port. The first batch charger was turned off and returned after a while. But it turns off and will NOT come back. Sometimes I don't realize it until I get an alert that my battery is down to 10%. To charge it again, I unplugged it and plugged it back in. It's still usable most of the time, and it's more convenient to unplug and plug in a real USB-C charger if you already have a MagSafe. But it's also impossible to plug in and forget if you're using it all day - you have to keep checking that it's still working.
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