Seeing in a different non-photo setting: I assume [perhaps incorrectly] that picsman would not buy a water pump for his car from an auto-parts store but rather would go to the dealer to buy the same unit at a much higher price. Knowing that only a dealer mechanic could possibly repair his car...

Batteries: Really, people, I have always used 3rd Party batteries [picsman called them fake a condemning emotional word].. voltage is the same [measured] but the price much much lower and a new modern dual battery digital indicating charger included. Bunkhood prevails and people waste their money... Of course, it is their privilege.

What measurements do the faithful to the OEM use to prove 3rd Party to be a danger or inferior? Will your 3rd party batteries cause your camera to catch fire and cause a plane to crash?

Give a read to a Fake Battery user... oops.. aftermarket battery...
https://photographylife.com/reviews/third-party-batteries-watson-and-wasabi

I order a Nikon en-el15b from a website at a low price (in the UK). On arrival I compared it to a genuine battery provided with my new D780. The main difference was that the plastic cover was shiney not matt as the genuine one. There were other differences in that details on the back were not presented in the same way although the fonts appeared similar. Also the reflective security label was slightly different having some diagonal lines showing at different angles.

I don't know that the battery was fake but emailed the vendor and he immediately refunded me.

Was it fake?