Hello, be careful when you open it. The keyboard foil is connected to the computer center with two small, delicate cables. The plug connections on these cables are delicate and not very stable. These cables are dimensioned so that they can only accommodate an opening of about 45 degrees between the keyboard foil and the computer board. If you open it more than 45 degrees without thinking, it can happen (like it did to me) that the cables suddenly slip out of their slots and you have to puzzle and fumble to put everything back together correctly. I think that's a bit unreasonable for changing a battery.