Thanks for the questions.
I had the replaced battery for 2 years before I recently traded it in for a 14" MBP.
Charging habits were poor: leaving it plugged in most of the time. This is what I think led to the original battery swelling. These older MPBs and MacOS's did not have the improved charging now provided by Apple.
The brand was Puredick (!):
Puredick A1582 A1502 Battery, Replacement Battery A1502 for MacBook Pro 13 inch Retina [ Early 2015, Mid 2014, Late 2013 ] A1493 - High-Performance and Longevity [11.36V 74.9Wh 18Months Warranty]
www.amazon.com
It appeared to last a good day when on battery, but I did not do any rigorous comparison testing, so is just an impression.
This was for a base 13" 2015 MBP, which is very underpowered by today's standards, so I was not prepared to spend much at all on it, planning to keep it only for another year or two. For a better spec 15" 2015 MBP, it would probably be worth spending more.
It took me a few hours and lots of Youtube DIY videos, because I took it slow and careful. Not recommended for those uncomfortable with this sort of thing.
I actually think the Apple replacement with top case and new keyboard is a pretty good deal, if you are prepared to spend $200 on an old laptop. More so for the 15" than the 13".
Anyway, my point isn't so much recommending OP replace battery themself, as suggesting don't assume a non-OEM (iFixit) battery is no good. It would be somewhat disappointing to spend $200 on an old laptop only to discover the battery life is not much better.