Also, you can run a thin plastic card (like a gift card) behind the battery to gradually work at the adhesive behind it. Just pop up a side with a spudger for clearance and shimmy the card back and forth to gradually remove the adhesive.

After installing the new battery I got, my display wasn’t coming on. For me, I just didn’t seat the display connector (next to the top most antenna post). Disconnecting it and reseating it did the trick.