Battery part number doesn't exist on HP partsurfer

Hello

So I've been having problems with my laptop recently. The laptop isn't even that old (bought it on Oct 2017) but the battery is already showing its age. Symptoms are it'd stop charging randomly but it will resume itself and when I play a game with high performance battery profile it would just instantly die when it hits a certain battery level, as low as 30% and a few days ago it died on 70% battery. I was considering to purchase a replacement so I checked the battery part number on HP partsurfer but the battery for that laptop was listed as 919701-850, while what is printed on my battery is 919682-121 which doesn't exist on the list:

http://partsurfermobile.hp.com/?search=2...

Is it possible the battery that is currently inside my laptop a refurbished product or worse a counterfeit?