I'd recommend reading some of the reviews posted below iFixit's sale page for that battery. One of them says:
"This was to do a second battery replacement on my 2014 retina MBP, the first one (purchased here about 4 years ago) never worked right and had the service battery icon with under 100 cycles. This one, immediately after performing calibration procedure, lasted almost 3 hours streaming HD video at full brightness, which is a massive improvement over the 30 minutes I got on the old one."
I think 3 hours is probably a safe estimate for the charge life of one of these from my experience. Not sure if that's worth it to you. Good luck!