Like others here, my trackpad's battery swelled to the point of pushing open the backplate. I picked up the battery Patrik linked from AliExpress and performed the repair. The battery arrived in 25 days. The backplate open: A closeup of the two batteries for comparison: I cleaned off the adhesive and installed the new battery. I clicked the backplate into place without adding more adhesive. The backplate stays in place on its own when sitting on a desk. And, it connected without issue: All features work.