Re-test the LCD once you've attached the adhesive and before you seal it up, and then you're good to go! Once it's back together, I also like to heat up the Tesa Tape/device slightly and apply light pressure so that the tape gets tacky and does begin to stick both sides together consistently.

You can also see from the 2nd picture that the LCD/Cover do sit quite flush with Tesa Tape (DIY Method), and seem to seat/seal well, so hence why it's my preferred option (aside from the Pebble being designed for similar stuff). The 4th photo shows the results after the Apple Watch Adhesive Method, which seems to sit even more flush.

But otherwise, you're done! Enjoy your new watch battery - also, a shameless Pebble Nav Me plug in there as well!