Battery % jumping around

[Geforcepw]

I have a Moto g5s plus, new battery installed however I am suffering from the following
Battery % jumps when charging while phone is off, when I remove cable and insert again % jumps again.
When battery gets to around 20 - 30% the phone can die suddenly.
I was hoping a new battery would solve this issue but still have issues.

 

[ashune]

Did you get an original battery or a third-party one? Looks like it's a bad battery.

 

[Geforcepw]

Did you get an original battery or a third-party one? Looks like it's a bad battery.

Just one from eBay so probably 3rd party