Use extreme caution when removing the battery. It is directly against the motherboard, and piercing the battery could corrode other components. It could also catch flame.

Take off the battery shield, and use a scalpel or other flat tool to remove the foam on the connector. Place these onto new battery.

Carefully apply some low heat to the stickers covering the battery and gently peel them off. The white sticker is connected to adhesive under the battery.

Gently pry up on the edges of the battery so that the adhesive will come out more easily. Take great care not to pierce the black "skin" on the battery.

Slowly start pulling the adhesive tab out, regripping close to the battery as it starts to come out.