Checked ifixit. Quite involved to say the least
https://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Retina+Display+Mid+2014+Battery+Replacement/90276
Wow 😅 Looking through the comments there seem to be a lot of people who prefer to skip most of that teardown though and "cut" the batteries off with string.. I'd definitely try that first.
@salad started
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Checked ifixit. Quite involved to say the least
https://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Retina+Display+Mid+2014+Battery+Replacement/90276