Eleanor SpenceleyI did a successful replacement on my old MBP. I must admit it wasn't easy since the batteries are glued in but it was successful.
Got my battery and very useful replacement kit from iFixIt https://store.ifixit.co.uk/collections/parts and rather than following a very long process of dismantling the whole device and lots of solvent opted for a brute force with a fishing line approach https://www.youtube.com/watch?v=rfHHIERH2J0.
80lb fishing line was a great thread for this! :-)
Saved a bunch of money not going to an Apple store, but it's not for the faint hearted!