You should be aware of the fact that your Mac’s T2 security chip is not so secure.
The ideal standard USB-C cable for a lot of MacBook users.
A powerful Baseus Power Supply: Two USB-C and up to 120 Watts.
An Anker power supply with two USB-C ports: one with 45 and one with a maximum of 18 watts charging power.
MacBooks increase battery life by lowering the display brightness when in battery mode.
For troubleshooting or used purchase: diagnostic software that checks Mac hardware (RAM, display, keyboard, hard drive)