Depending on the model you might be able to find it online. My system 76 had a “Clevo” ID on the bottom sticker ( the company that manufactures the computers) I used to buy a replacement fan.
It’s too bad there isn’t standard cells anymore. I did notice my Bluetooth speaker (which had replacement batteries available) also had instruction videos floating around on buying replacement cells and rebuilding the battery pack.
Laptop packs I don’t think are typically made of replacable cells.