Mr_Scary wrote:
I bought a 2022 MacBook Pro M1. I have had it for about a month and have kept the charger plugged in, and it always maintained a green light and at 100% charge. Yesterday, the light turned orange and I noticed that the charge kept decreasing to around 82-84 % for no reason. Do I have a faulty charge cord or a bad battery? Thank you.
No, I would just observe how it goes over the next month or so and compare the results. The battery is covered under the hardware warranty.
The rule of thumb is if you are near the mains leave it plugged in, if you need the portability then run on battery only.
Let the Battery Health Management software work for you.
About battery health management in Mac notebooks - Apple Support
You still have an expected 1000 cycle count on your battery.
Determine battery cycle count for Mac laptops - Apple Support