I realize my SE is pretty “old” at this point in time, so I’m guessing the replacement kit is also old stock. My replacement adhesive strips that came with the battery would not separate from the blue backing at all, so I ended up installing the battery without any strips. Hopefully, this won’t result in any problems; it seems like the battery fits inside snugly, so I don’t anticipate it moving around. This replacement was done simultaneously with the lightning connector assembly replacement. I figured I’d do it all at once.