There are different levels of battery quality. Adding a $1 battery versus $5 battery isn’t a big difference to OEMS who are buying millions to put in their 1000$ widget. Additionally economy of scale, and they want their remote to last a certain time so they pick a battery that will meet that standard.
For retailing sales, users want cheap batteries and aren’t really concerned with the batteries actual longevity or quality.
Check out project farm, I believe he reviewed some batteries a little while ago. You’ll see a massive difference between all of them
And? A firm you paid found nothing. Big shock.
But actually, these things boil down to he said, she said, and most of the employees involved have left th company. Not really much to investigate