Not only that. The battery doesn't come out that cleanly many times. And the glue separates from the phone body and is stringy. Simple prying the battery out and reusing the glue is not at all realistic many times. In fact, I have a phone on the bench with a rattling battery now that has to be reopened and reglued. The old adhesive is not reliable often. We need a replacement glue solution. I am thinking about adding a couple dabs of silicone.
I repaired a phone and the old adhesive didn't bond well. I believe the client dropped the phone and the battery power connector strap ripped away from the battery, leaving the battery jiggling and destroyed.. The battery has weight, that adhesive is there for a reason.