Apple batteries are glued for two reasons: - The aluminium laptop case is part of the battery. In the old days there was a plastic case/shell around the bat

Apple batteries are glued for two reasons: - The aluminium laptop case is part of the battery. In the old days there was a plastic case/shell around the battery cells. Now the laptop case is that shell. - It allows them to make the laptops thinner. When you are talking about the need to save millimeters here and there in order to have a very thin total design then you need to remove screws, tabs and stuff that pads up space.