it’s hard to make out the photo solder flows towards the heat.

Video https://streamable.com/zeu6gm

Thanks for all the info so far! I’m trying some stuff but failing miselably haha

Added video https://streamable.com/zeu6gm

additional internal battery

After removing the CMOS battery in addition to the main battery, and powering the laptop on it worked. After, I readded both batteries and it now continues working. Maybe I should replace both batteries to avoid that happening again in the future?

Thank you very much for your support!