RZ09-02202 Battery

I received a fairly cheap Razer Blade Pro- 2017 (Model: RZ09-02202) from the Facebook marketplace. It doesn't have a battery at all, and I've just been using it plugged in. I went to Geek Squad and they said they could get me a battery but I didn't have their warranty/protection plan, and I cant find anything on Amazon or Ebay. I went onto the Razer support to see if they can help but its (obviously) outside of the limited warranty and their only advice was to post here. I am willing to pay a good amount of money to get a battery, I just need help finding one. Thanks :)