Late 2015 Macbook Pro Trackpad Repair, Saved me Tons of Cash!!!!!
My trackpad suddenly stopped working all together, no tactile response and the cursor slowly faded, ultimately it was dead. I heard it was the ribbon, but after some research people suggested replacing the whole trackpad, ribbon and battery.
Repair was super smooth, I HIGHLY suggest using quality tools, if you don't you will break the tips off and / or strip your screws. These tiny screws are in tight.
I did not use anything but the plastic card to remove the batteries, I also did not replace the ribbon or put in new batteries. If you go slow with the battery glue and just work it free you can keep everything intact. I suggest taping the batteries to each other to prevent separation or the cables between them getting tristed.