Chosen Solution
I am going to buy a new battery for my iPhone 6s+, in the first weeks of use of this new battery I’d like to test it and in case return it if it’s malfunctioning, So i want to assure the battery is easily removable by putting some tape between the case and the battery, is there any risk of maybe breaking the screen or the battery detatching completely? The solution is temporary
As long as the battery connector is snapped in properly and the cover plate with the two screws is screwed down, then you can use one or two small strips of double sided adhesive to hold it down temporarily.