Once again, heat the battery area uniformly until it is warm/hot to the touch

Insert a second opening device around the area of the first, but moving towards the corner of the battery, in an attempt to begin separating from the side

Push your opening tools as far as you can and pry upwards. Repeat the heating process if necessary, and with enough love and care, the battery should release. In the third picture, you can see the areas that adhere the battery to the case