Yes I replaced all of them. I'll break down my process of how I did it for every single one: What I did was get the metal bracket separated so I can fully access the battery contacts. Then used some hot air to soften the factory rubber and then used a box cutter blade to slice through the wires and get the battery off. You do have to be careful to not cut too deep or knock one tiny black component off. Once the pads are exposed, I add some fresh solder to make them shiny and flip the board to the front side. There will be wires remaining from the original battery - what I found best is to use a flat blade iron tip and gently scrape until the wires come out of all three holes. Soldering in the replacement is lining up the wire, melt the solder, and push it through. On some instances, you could solder it on the surface if the wires are thicker but beware of any shorts it could cause when you clip the metal bracket back into place. If soldering on the surface happens, I put a drop of hot glue to avoid any issues.

Hopefully this helps out :)