Dell Xps 13 Battery Is it Geniune ?

Hello there , 

My Laptop is Dell Xps 13 9350 

I bought a new Battery but not from Dell . 

How can i know if it original by serial No. or Qr Code  ?

When i installed the new Battery It giving that the Full Charge Capacity 50,912 mwh and Design Capacity is 52,668 mwh and the Written Capacity on the battery is 56,000 mwh 

Is that Normal ?

I think the Manufacture date of new battery is 2017 

Thanks 

Regards