Here's clever hack (shared by a viewer) for directly charging the battery pack from the outside, until the BMS can take over.

I also show multiple ways to check for charging status, without using a special in-line USB Meter.

Here's the stuff I used in this video:

USB power meter
https://amzn.to/3W4qnbI

200W Desktop 5-Port GaN Charger with LCD Display
https://amzn.to/4dS0HF9

USB-A to alligator clips
https://amzn.to/3WUVPta

USB-A to USB-C Adapter
https://amzn.to/4duKcym