We will start by removing the back cover. For this we will use a plastic opening tool, we introduce it between the casing and the frame and we will make lever movements so that it is released.

Now we will remove the thermal adhesive (kapton) that holds the battery and we will proceed to desolder the cables of the motherboard.

To take off the battery we will use a flat plastic tool to avoid damaging it. With care, we will slide the tool below it avoiding to bend it.